Actually I don't think the 1000 by 2030 is necessarily true.

China's nuclear strategy is minimum deterence because they learned very quickly that stockpiling like Russia was not a good idea.

I'm sure they're just mad about the USA doing anything, but I could see them being ticked off by the USA trying to force them into a nuclear arms race.

Also probably scared that the USA is going to dump a ton of money into things like hypersonics and LRAAMs again, which is probably the only two things China has a current advantage in lol.