I don't know about that.

The weight of solar panels on my local swimming pool roof would be much lower than the weight of a heavy snowfall building up on the flat roof (originally I was studying structural engineering).

With rooftop installations there is also the possibility to place them in the locations where there is a higher degree of tolerance. Snow unfortunately builds up across the entire surface.

If course it is definitely something to be double checked on a case by case basis but I don't think solar panel weight would be a problem in every case.