You don't honestly believe he literally means what he says here, do you? Or do you?
Do you honestly think he didn't?
What was said is nothing more than the bare facts.
The US has the more powerful military, but that military is mostly based State side, with its overseas forces spread throughout the world, only a fraction of which are close enough to get into most potential conflict zones involving China.
Chinese forces OTH are almost entirely concerntrated within most such potential conflict zones, and can certainly redeploy far more rapidly compared to US reinforcements.
The US could bring significantly more forces to bare in any conflict Han what it has forward deployed, but that will take time.
It would be extremely foolish for any US local field commander to not always have that in the back of his mind - if a shooting war was to break out unexpectedly, China will absolutely enjoy significant local tactical and strategic force superiority in the opening stages.
That is why the US is stressing so much about local allies' 'defensive' capabilities.
In the event of open conflict between China and an US ally in the region, US PACOM forces are certainly not going to be rushing in immediately if they could help it, unless exceptional circumstances are in play which makes the US willing to spend thounsands of its troops' lives to buy time.
What the US would want is for its allies to be able to hold out independently for the weeks or even months it will need for them to pull sufficient forces from around the world to achieve the critical mass needed to have a good chance of victory before getting involved in the fighting directly. To engage prematurely would be to court defeat.
That time margin between Chinese expected victory time and the time it will take for the US to gather enough forces in the region to risk direct, open conflict is where the unofficial arms race is focused on, and what the military part of the pivot is all about.
In many respects, it's also what the SCS dispute is largely about.
The US wanted to build up allies and rivals of China in the SCS sufficiently that they could pose a threat to the oh-so-frequently mentioned vital shipping lanes that goes through the region.
The intention was to either build up proxies they could use to threaten China's sea bases trade and supply jugular without having to do dirty their own hands and reputation, and/or to force the Chinese to redeploy sufficient forces to face and counter the new Southern threat, that the balance of forces in North East Asia are less unfavourable for the US and its key allies of Japan and South Korea.
Without the new SCS island bases, it would have been quite a logistical distraction for the PLAN to maintain sufficient forces in the region to be able to comfortably outmatch any potential threat in the SCS. And that would only be against the likes of Vietnam. It would take significantly more forces to be able to stand up to an USN CSG.
Even if the PLAN does not need to draw ships and other assets from the ESF or NSF, it would at a minimal tie the SSF down such that they cannot redeploy to help out much in the East or North without risking leaving China's southern flank exposed.
First elevating the importance of the SCS disputes, and then increasing tensions to put pressure on China was entirely a calculated strategic move on the part of the US. That was to help encourage small countries with rival claims to openly challenge China on the first level; which gave the US the opening to insert itself into disputes that have nothing to do with them; which in turn paves the way for the US to establish military bases in the region to 'open up a southern front' in its containment Cold War-lite against China.
China saw the danger, and went big.
By building the islands, not only did China demonstrate a level of capabilities and resolve that gave the likes of Vietnam and the Philipines pause (see the quiet walk back on the part of Vietnam, and the not so quick push back from the Philipines after they realised playing America's game has fundamentally changed their entire strategic and security outlook for the worse); it also effectively neutered the usefulness of the ultimate prize the US was shoot for - a Subic Bay naval base.
The US could certainly still set up a nice big naval base there. But they must expect China to build a rival one on Scarborough Shoal in response.
The two bases will easily be within weapons range of each other, so the opening moves of any open conflict will most likely see those two bases wipe each other out.
The whole point of the US originally liking Subic was that it was close enough to be a useful base for SCS operations, yet still far enough from China to not really be at much risk of attack.
They were hoping to set up a large scale theatre command there, much like Diago Garcia. However, with the islands already created, and the not-so-suble hints about Scarborough, China is effectively throwing giant wrenches in America's grand plans by making it clear it could easily make what should have been a nice, safe rear-echelon command and staging base into a hot front-line FOB.
That will have enormous implications about the kind of assets and investments the US could deploy and build there, which ultimately will impact the importance of the base to the US.
Little wonder the US was going cold on the idea even before the new Philipines government started turning hostile to American leadership.