It was an "Attack Ground" command. Meaning it fires at that spot, and "hits" intervening armor if the shell would otherwise land in the scatter area to the rear of the vehicle, away from the PaK.
Nor do PaK's not hit friendly targets.
All of us have seen units die to PaK friendly fire.
Saw Fatal blow up his own FHT the other night with a PaK positioned behind it.
The dev says "it won't take the hit", so it won't take the hit.
Let me explain you the video since you seem not to understand:
there's NO WAY a shell can land behind a tank, therefore the change in scatter DISTANCE (firing shorter or longer in the same straight line) only makes shorter shot miss tanks.
T70 gets missed because it's small, and that makes it hard to direct hit.
It's speed has nothing to do with the chance of landing a direct hit.
If you don't land a direct hit higher scatter is better vs moving targets, lower scatter is better vs stationary targets
so, basically, the changes in the patch have no effect in P4vsT70 matchups