And still, when it comes to fifth generation planes, it's not a number that matches US' figures, as in the above speculation they've produced 100 f35 per year. Plus a few more squadrons of F18E, perhaps a few squadrons of next gen fighter in very late 2020s and 50+ B21s. Overall totals might be similar, 110 or so per year, but US's include more of the new tech planes.
You are missing the point. The amount of F-35 deployed near East Asia can't be more than 500. That is all China need to counter. The limitation is the size of the military base.