It got denied by Shilao, expected and not surprised.
View attachment 101195
Bit of a vague reply, though not unexpected given how specific Lyman's own estimates were...
I am not trying to be pessimistic here, but do we have hard evidence that CB0XYZ exactly means? X is batch number for sure however the last two digits can mean XXth within the same batch or XXth in total production. I am looking for counter evidence against the latter one. For example, are there any photos indicating a production number like CB0101 or CB0310 to confirm the last two digits are counted independently between batches?
If we could confirm it, the total units would be at least 18 + 40 + 56 + 70 = 184.
So, to address this part, the reason why YZ is attributed and assumed to mean "XXth within the same batch" is because there's no clear way in which it could mean "XXth in total production".
That is to say, what happens when total production reaches three digits, and once the production batch reaches two digits?
The alternative is that the could simply add in additional digits to the CB serials, but that would also be a bit strange given they seem to have chosen a handy four digit system that seemingly should be able to account for 99 batches of aircraft of up to 99 aircraft per batch that would allow them to cover the full production run of the aircraft for its entire possible production size.
Overall, I think the CB0370 serial should be considered seriously, but we should also keep an open mind as to what it may mean.
For what it is worth, talking to a certain highly regarded ex-user here before he requested his account be banned, the higher estimate count for J-20 implied by CB0370 appears to be being taken seriously.
Also, it is also worth keeping in mind that sometimes Chinese PLA watching personalities may also have a degree of motivation to mislead or downplay certain things as well as ultimately they are still also constrained to opsec.
I do treat the idea of that many J-20s with substantial caution and a bit of skepticism, but I don't think we can reasonably expect a definitive "true/false" for the idea of there being that many J-20s produced.