Yes you are correct re penetrations.
If you look, as I do, at the battle log it will tell you info on the vehicles you hit.
Examples like - Penetrations 1 - Damage 220 - You destroyed this tank, I understand as possibly 220 was all the health left on the tank.
But ....
I am counting all those with the likes of
Pen 1 - Damage 235 - You did NOT destroy this tank
Pen 2 - damage 455 - You did NOT destroy this tank
With almost zero cases of Damage over 450, when the pen figure for the Arty is 850 to 1000+ (3 diff artys) there has to be some thing wrong here.
FYI - here's the relative stats from my last battle.
Tier IX B-C 155 55
Shots fired 19 - Pens 11
Targets Info
1 Pen - 254 - Destroyed
1 Pen - 391 - Not Destroyed
1 pen - 216 - Not Destroyed
2 pen - 648 - Not Destroyed
1 Pen - 409 - Destroyed
1 pen - 249 - Not Destroyed
4 Pen - 1366 - Not Destroyed
Hope the above makes it clearer.
To irrumatio
Of course they are not penetrations. Why on earth could they be when the game says they are . Not possible is it ?