Somehow link is 404ed. But I found this is the Brigadization of the PLA Air Force report I've previously downloaded (and it's still downloadable now, so I guess the url was changed).
This open-source work strikes me as both venerable and unsatisfactory. Apart from the sketchy numbers (for example the ridiculous J-10B number, the missing Su-27UBK number which should be easy to compile, among other things), it even has a few dozen grammatical and spelling mistakes... The J-7 numbers are probably far from accurate either, even if we apply a Feb. 2018 cap for available information.
The author is also on SNS (ex. Quora) and he seems to know his stuff, so I'm kind of surprised but in the meantime not very - because he's a strategic instead of tactical/air force guy. He did say somewhere that he was merely in charge of overseeing the work which came from a team though.
I wonder if anyone else here on SDF has anything to say about this work. Or maybe this question should be raised in some other thread?