I actually did not like this book very much (it was too twee for my taste, and felt like a weird mashup of a children’s and an adult-targeted book), but this is a ridiculous complaint. If you’re finding that all the authors you like are “problematic,” my sense from this post is that you’re probably looking very hard for reasons to cancel them and creating your own sense of disappointment. It read like more of an allegory for queerness than anything else; if it was inspired by this history, the final product is so far removed from it that I would never have guessed. In any case, it sounds like he’s been forthright and apologetic to the extent that he even needs to be. I’ll third the suggestion that you read this post and think about how making accusatory posts like this can be harmful to authors’ mental health.