it’s hard to see the PLAAF being prepared to give up almost a full year’s worth of J10C production capacity to give the PAF so many brand new J10s in one go.
The assumption being production of these J-10C's started a year ago.
I doubt that's the case, since even I heard about it before the start of the pandemic.
So if they began production years before the announcement, it would've been a small subset of total capacity over time.