Is `conv2d_gradfix` really incompatible with PyTorch > 1.8?

[elimohl]

There is a check that doesn't allow to use conv2d_gradfix with PyTorch 1.9.0 (or later):

alias-free-gan-pytorch/stylegan2/op/conv2d_gradfix.py

Line 85 in 0e95128

if any(torch.__version__.startswith(x) for x in ["1.7.", "1.8."]):

Is there really some specific functionality that only PyTorch 1.7 and 1.8 have, or is it the check outdated?