They drew abstract conclusions from historical evidence,..
When noted Nazi historians mentioned that Hitler was a male prostitute as a young man and that the SS was created in a gay bar in Munich, there is nothing "abstract" about those statements.
that doesn't mean it's accurate. They clearly had a very strong bias which strips their work of any historical integrity.
I've covered this topic extrensively, so I'm not going to spend any more time on it, but the thing to remember is how much the current LGBTQueer movement has in common with Hitler's SS.