Should be, for the 3rd-4th quarter last year, we got
cangzhou (1 dadui, 10),
dingxin (2 dadui 20),
wuhu (2-3 dadui 20-30),
anshan (1-2 dadui, 10-20),
Guilin? (1 dadui, 10),
korla (1 dadui, 10),
that’s 80-100 at least
and to produce another 30+ in the past 8-12 months is totally possible
If I am reading this correctly, you're saying that the Chinese military forum watches (assuming they're your source) had four frontline brigades using the J-20, on top of the training/tactics bases, by the end of 2021?
Not sure how that meshes with some other info we had. Scramble.nl says Korla (111th brigade) began receiving J-20s in 2022, not in the fourth quarter of 2021.
I believe I also saw Deino, over at CDF, also post J-20 at Korla info in April 2022, not earlier. Though he may be best to clarify whether he also had knowledge of J-20 being at Korla earlier than that.
Allow me to also try to expand your list with dates when J-20 were first spotted at units, using CDF, Huitong and Scramble info.
The only big sticking point is that scramble claims 1st brigade got their J20 in 2020 while CDF/Huitong say it was in 2021.
(I am leaving out the 56th brigade for now, as one image isn't sufficient to be as sure of it as with other units)
cangzhou (1 dadui, 10), around 2018
dingxin (2 dadui 20), around 2016
wuhu (2-3 dadui 20-30), 9th, mid 2018
anshan (1-2 dadui, 10-20), 1st, early 2020 or early 2021? some/all WS10
Guilin? (1 dadui, 10), 5th, late 2021, WS10
korla (1 dadui, 10), 111th, early 2022, WS10