Yeah, I agree that the overall utility and technical meat of his posts has dropped off in the last couple of years. (Critics will likely jump in with "What technical meat?") I don't think that's an issue with this particular post, however.

I'm not sure why you doubt his sincerity. Stack Overflow is where he's spending most of his time these days, isn't it? Why wouldn't he be mentioning it in most of his posts? It seemed appropriate for this post. What would constitute a sincere blog post?