Are you intentionally missing the point? Our films made in the US are already neutered from a free-speech perspective because we're chasing opinions that are politically correct in China. We don't want to worsen that by bending to every foreign tax break. We should be making unapologetically American movies, and if foreign consumers still watch those movies, all the better. But we shouldn't be writing these to a lowest common denominator of politically correct speech. It's how we've arrived at a point where all we produce is Marvel slop.
There's some point in that, although certainly not all US movie companies are self censoring in favor of China. Also, if the goal is to prevent chasing Chinese opinions, why not specifically target China?
Or are countries like Canada or the UK also seen as part of "a concerted effort by other Nations"?