Pretty sure he is saying the US between 1959 and 1989 built more ships than china has between 2003 and 2021. And even if you average the total number of ships built by the US between 59 and 89 it would still be more ships per year than China built on average per year between 03 and 21.
I have no idea of the veracity of either of the claims you made as I couldn't care less about US historical shipbuilding capabilities. If I'm concerned with anything of America's, it's its present and future capacities. Furthermore, this is getting way off topic in a flagship (literally and figuratively) thread (nudge to
@Bltizo).
I do, however, want to point out two important factors that are being overlooked. The major shipbuilding drive in China didn't start in 2003, but after 2010. One could choose several starting points around that period, be it technical ones like the launch of the first 052D DDG
Kunming in 2012, or political ones like the start of the first term of the Xi Administration in 2013. Starting the count at 2003 seems odd to me - perhaps that has something to do with the launch of the corvettes/frigates 056 and 054/A, but I'm not terribly interested in little ships so the rationale eludes me.
The second and more important factor is shipbuilding capacity utilization. Any which way you slice it, the inescapable conclusion is that China is using nowhere near dedicating its full shipbuilding capacity to naval modernization and expansion. By percentage of GDP, China doesn't even meet the NATO minimum of 2%, let alone Cold War spending levels which reached double-digit percentages. I've heard it mentioned off-hand by someone I consider the height of reliability that China could expand its current construction rate of major combatants by 10x using its existing capacity. While that would entail dedicating
all national shipbuilding to the navy (which is what the US, having no commercial shipbuilding industry to speak of, implicitly does), there's still a lot of scope between that and what China currently commits. China has a lot of room to expand its buildup if it feels it's in a "Cold War" scenario and must respond militarily.