This is no different than the Double genocide theory, a form of Holocaust trivialization.

Mao and Stalin comitted atrocities, but equating them to the other 4 fascists is insane.

Double genocide theory (Lithuanian: Dvigubo genocido požiūris, lit. ‘Double genocide approach’) is a term used to refer to the claim that the atrocities committed by the Soviet Union against Eastern Europeans constitute a genocide that was equivalent in scale and nature to the Holocaust, in which approximately six million Jews were systematically murdered by Nazi Germany. The theory first gained popularity in Lithuania after the fall of the Soviet Union in 1991, particularly in discussions about the Holocaust in Lithuania.[2]