Well the Beta 222 could kill a T34 if it had VET 2 for the armor bonus, but that 222 did almost no damage to infantry when you upgraded the gun
If you could circle the T-34 and avoid the turret rotating on you (smoke was good for this!), then yes, you could kill a T-34, but it required good micro. The MG34 getting disabled with the cannon upgrade was a later bug, they both worked simultaneously in the alpha.
The alpha 222 was much more like the PE 222. Something in between how it is now and how it was in the alpha would be great.