First, Simpleflying is a terrible sourceNo, the rampup started a few years ago up to 70 around 2023 and then up again to around 100 last year. The J-16 production numbers are going up in the recent past not winding down as J-10s are inducted in ever decreasing numbers.
The Flanker lines and components streams with J-16 and J-15 variants will be busy for years. You need range and carrying capacity whether PLAAF or PLAN. You cannot carry much fuel or ordance internally period.
I think the all-stealth force that people suddenly think is available "now that we have the J-35" is highly irrational.
Second, why on earth do you need 1000+ J-16s? There is 400+ J-16s built and they are sufficient for what is expected.
Third, how'd you intend on repelling over one thousand F-35 that the US and it's allies in southeast asia will have by 2030? J-20 numbers would barely break 1000 by 2030 and peak production rate might be slowed in the later years as more lines are delicated to J-36. China needs overwhelming dominance in the SCS in a Taiwan scenario.
Building more J-16 makes no sense, long range strike role in the 2030s would be replaced by H-20 and J-36 while the 400+ J-16 PLAAF have right now is totally sufficient for low intensity conflicts and against low end targets.