The core stuff is under heavy lock and key. I’m not sure China can hire people that know the whole process, let alone the bits and pieces they can’t easily figure out on their own. The tech seems to have been locked down by a few western countries, and it’s hard to find any holes in their secrecy.

I'm not sure how true this is but I've read in other threads that ASML employs many Chinese engineers, and also read other news that the Chinese state is paying engineers working abroad at companies like ASML alluring salaries to get them to work back home.

Espionage