If it's just about regulation why hasn't China (or anyone) broken the stagnation? It's unwarranted regulations in every country?
Note: the AP1000 isn't French: its a Westinghouse reactor. This Westinghouse division filed for Chapter 11, see https://en.wikipedia.org/wiki/Westinghouse_Electric_Company
The French one is the EPR (European Pressurized Reactor) https://en.wikipedia.org/wiki/EPR_(nuclear_reactor)
2 of them were built in China. The project reached 60% overcost, was 5 years late and according to the French financial Court of Audit may not reach the break-even point. Then one of the reactors had an incident and is shutdown since mid-2021. Not sure all this is "thriving"... https://www.cnn.com/2021/07/31/asia/taishan-nuclear-plant-in...