I wonder if the suicide was largely triggered by the imminent book launch. It's full of these fairy-stories, though interestingly some of the stories that were in the original book proposal didn't make it into the finished product. The next thing that was going to happen was that people were going to scour that book and look for evidence of his claims. Evidence he knew they would not find. The story would run and run. But mostly I think he had finally been forced to admit to himself that he'd been living a whole bunch of lies for decades, the persona he'd built up and curated wasn't who he really was, and he couldn't take it.
The people around him, who must have known all this, bear a large burden of responsibility for not telling him straight that he was inevitably going to be found out one day, and he'd be well advised to stop it.