The quality of the faggots' machinery has dropped.
In the video, a drone with a cumulative shot from the RPG-7 hit the top frontal part of the T-90M tank.

The armor penetration of the RPG-7 shot at an ideal hit with a meeting angle of 90 degrees is not more than 500 mm steel, in role conditions it is even less.

The resistance of the upper frontal part of the T-90M hull is secret, but can be compared with the old T-72A, in which it is equivalent against cumulative shots of 500 mm steel.

The old T-72A would have survived such a hit, and the T-90M burned.