Doesn't look as it flat strafing passes by Hizooka or .50-equipped planes will disable or kill your tank.
Diving still works, have got some films but I'll have to wait to take a close look at them to see what sort of angle of attack needs to be achieved to get penetration.
I think an angle of around 30 degrees is still sufficient to kill Panzers with Hizookas, which is still about 30 degrees to low IMO, but it beats the hell out of some newbie giving you a couple rounds as he flies past and knocking out your turret.