The classified natoid armour was removed from frontal aspects that are designed to defeat APFSDS rounds in tank vs tank combat. Meanwhile, Russian drones are hitting spots that never had that armour in the first place by going for weakspots like the roof or the poorly protected ammo compartment at the back of the turret.

Even if these tanks were rolling around with their original armour, it wouldn't have saved any of the tanks that have been defeated so far.