Way to completely miss both of my points.
Ostwind isnt OP vs tanks, its just so OP in general as it does something that should never be possible - AA vehicle seriosly challenging medium tank in frontal engagement on top of being most effective AI behicle Ost has and costing same fuel as T-34 and sitting tier lower than said T-34. AA stands for anti-air, not anti-all which current Ostwind is
It doesn't seriously challenge a T-34/76 in the slightest. The video in the OP is both invoking Lanchester's Law and showing a run of bad luck for the T-34/76 on penetration rolls.
Boot up the CheatMod yourself and see how well an Ostwind fares against a T-34.