I think you answered my question, thanks.Who is "they". Do you mean the PLA?
Of course the PLA will not release that sort of information.
If anyone wants to include a PLA aircraft in a video game like DCS (and yes, despite its valiant attempts to be "realistic" it is ultimately just a videogame) they will just have to give it their best estimate, in the same way that all other aircraft in DCS are just their best estimates.
The best way to approach something like DCS is that it has no significant bearing or implication on real world aircraft performance, so therefore who cares if they want to include a PLA aircraft?
Was curious since developers are often required to have SMEs like pilots, mechanics or performance charts of an aircraft for it to be accepted for the game, so wondered if anything like this would be possible for say, a J-10. Predictably a no go for any "modern" Chinese type.