OP, as in overpowered?
From what we have in the game on land, the 88mm, that video would seem to (me) indicate that it’s underpowered, since there isn’t any way for us to compute bombers course and adjust trajectory.
Used to be most bombing runs were higher alt, not having to worry about 37mm, Whirble, Ostwind or M16. I see a lot of bombers at lower alts in this past year, but still high enough for only the 88 to be effective flak.
If bombers did those evasive maneuvers described in the video I wonder if the 88mm masters would have as much success.