Controversy is always good just before a book release, as there's no such thing as bad press.
He is clearly being inflammatory. Despite all the jokes about private schools in the UK over the decades, I would imagine if this teacher had been outed for playing with little boy's penises in the 1950's he would have had a bleak (and limited) future. And of course what pedo stops at this stage of grooming? I'm sure there were dozens of poor kids who copped worse.