Back 30 years ago, China and Russia both also had academic research into hypersonic vehicles and designs, including releasing payloads.
Research papers mean next of eff all. It is step 0 in a 50 step process to flying and testing something. Step 0 in a 100 step process in putting something into service and being able to produce it in numbers for an acceptable cost.
The USA has made at least step 0 back in the 1970s if not earlier. Big whoop. Step 0 was taken by a fractionally powerful China back in the 1990s and earlier by the Soviets. They just don't put all those papers out in public like NASA has to, although in China's case they do reveal some of those less important/revealing papers years or decades later. Some of those allowed even end up being shared here. The US has flown a few hypersonic craft (not ballistic missile types but also not waveriders until the last decade) many decades ago. Saying the US has academic research in hypersonic separation is a big whole lot of nothing because China and Russia would both have that in spades back in the 1990s. At the moment, only China and Russia have flown waveriders and HGV weapons in service. The US has not yet put into service a waverider, much less several types like China has. The US also has not been able to fly an intercontinental ranged HGV (endoatmosphere and under own propulsion and/or shockwaves) which so far only China has.
As said before, Dr. Combs actually isn't terribly intelligent. He very often make simple logical errors. Perhaps this is why his level of research and knowledge of hypersonics is roughly equivalent to a below average phd in a second rate university in China. Just because NASA shows a fraction of 1% of something technical doesn't mean others copied it decades later in full by some miracle and used that to fill in the 99% gaps and then somehow overtake by some margin. These dogmatic morons simply cannot believe that Chinese people are actually smart, capable of working, capable of thinking, capable of refining things, capable of figuring things out. To them, Chinese people absolutely must copy and get the first step somewhere else in every matter. Despite Chinese people being the foundation and the source of propulsion for nearly half of America's computing and software industries.
Dr. Combs, you forget that China had their own academic research and papers on hypersonics many decades ago too. Since the Russians don't show their papers, does that mean they have none? Does that mean they don't have hypersonic craft? And one wonders why the Americans are lagging. Their academics are woke retards more than they are real engineers.