My pet conspiracy theory about these leaks is that the military uses WarThunder as a training sim, and every now and then someone notices the physics/render is off so they "leak" the specs knowing some gaming nerd is going to fix it for them.
At least at one point, Russian tanks in the game had just free magic armor to protect the ammo carousel from cooking off from literally any hit. "Spall" and damage fragments would just magically not trigger the ammo cookoff, specifically on some Russian tanks.
You could even see it now in photos with Ukranian pilots, most likely for F-16 cockpit familiarization.
Remember that pilots spend quite a bit of time practicing on printed out posters of cockpits and DCS is quite better than that ;)
IIRC the PLA actually used modded Arma 3 for training.