That plane has me confused.
It seems to only be really good for hunting planes it gets behind of.
Meanwhile it is doing laughable splash to infantry and the damage it does to tanks is seemingly also small.
At some point it was nerfed to have the same splash as the explosive bullets of other planes, however the rates of fire are completely different so it seems to make poor balance.
Historically even the 20mm cannons could damage the soviet tanks and even more so what seems to the real counterpart of the Stuka B2 that is the JU 87G. If the wiki is correct, the this plane was an influence to the eventual development of the A-10 thunderbolt.
I think that at least the direct damage needs to somehow be better on ground targets without becoming even stronger vs planes