"Like I said, it will delay the Chinese labs for a couple years."

Not even that long. China can simply order its industries to stop supplying externally and go full-domestic. It has happened before in others parts of Chinese industry; it will happen again. As it stands China can easily build computational nodes at scale, and their LineShine supercomputer holds top place in the Supercomputer Top 500 at almost 2.2 exaflops. They have zero issues building performant hardware.

Couple of years? Their current technology level can make that less than a month.