I'm not entirely sure -- I was too busy being startled to register that, simply because it was coming over to me in places as a lot more about the author than the book than I expect from Dear Author. But I gathered from the transcript plus comment thread as of this morning UK time that one significant criticism was that they felt it was erotica rather than erotic romance.

I can't comment on that, as I haven't read the book myself yet -- you know where anything that isn't m/m or gen goes on my reading priority list. :-)