It's interesting that Harry's book is such a "huge bestseller" and at the same time, he and the wife are dropping off the chart in popularity.
I think people bought the book, out of curiosity here in the US and discovered the true Harry. If Harry wasn't liked before, it reinforced that dislike and if people were neutral or perhaps had some liking for him, they changed their minds.
Penguin plus Netflix made huge blunders by releasing the Harkle sagas only 4 months after the death of the Queen.