Roehm’s homosexuality is widely referenced in many historical books. Even Albert Speer talks about his homosexuality in some detail in “Inside the Third Reich.” The author of the article is describing the historical circumstances around Roehm’s death, and his homosexuality played a critical role in his murder. In fact, Hitler used it as a justification for his removal from power.
It’s referenced but never proven. I’m not saying it wasn’t possible it’s just that saying that about a person then was a common smear tactic.