If you're referring to my second paragraph, I put that there because I'd made those points in some recent threads regarding Riggs' book, and I thought it'd be conspicuous if I brought up his seminar without taking my previous statements into account.
That said, I don't think it's controversial to say that works of history where the historians openly present their opinions about the people they're covering create the appearance of partisanship. Riggs' book is a definitely a valuable read, and is absolutely the best coverage to date of the Lorraine Williams years of TSR's history. And of course, he's a gifted writer with a talent for creating entertaining reading, as well as presenting a lot of valuable research (though I wish he'd stop having certain things appear only in his Twitter feed (or X feed, or whatever it's called now); seriously, Ben, put those charts in the book!).
But every time Riggs refers to Gary Gygax as "Saint Gary," it weakens his credibility as a historian. I know a lot of people like to say that "objectivity" doesn't exist, since everything is filtered through the lens of perception, but that doesn't mean that it's not valuable to at least try to check our own biases (at least when writing a history book), rather than openly indulging in them.