I mean, maybe, but his wife's biography of him paints a much different picture. It could be that her biography reflects just their time together, which would have been before the 30s.
Separate the art from the artist. Many people who are shitbags produce good art and I can still enjoy the art without endorsing them. He was and is (and perhaps always will be) the GOAT in cosmic horror.
The idiom "separate the art from the artist" actually means the opposite to that. It means that it doesn't matter what the artist intended, if it caused offense then it is still offensive. Rather than, it doesn't matter how much offensive stuff put into the art if I don't find it offensive then it's fine.