Perhaps it's more fitting not to erase these names, but rather append swastikas to them, guiding readers towards a plaque that elucidates their heinous crimes as Nazis. In this way, the monument will persist as an enlightening reminder of who exactly the "victims of communism" truly are.
Those victims of communism monuments are such a stupid fucking thing, the implication always being that nobody ever died under capitalism. What a joke.
When they do this they're trying to draw an (obviously false) equivalence between the Nazis and Communists in an active way; or even insinuate the Nazis were better (which is definitional Nazi apologia) by doing weird shit like this --- counting Nazis killed as "victims of communism" or 'children that might have been born but weren't due to war' as victims of communism. Anyone who died or might have lived but didn't anywhere in the vicinity of anything tangential to communists are considered victims of communism to them. This particular organization of rightist lunatics even counts deaths from covid as victims of communism.