The Brother Grimm may well distance himself from this book, nevertheless the pair of them will both continue to be associated with everything that comes out of The Pandora's Box of ill will, aimed at the Royal family having lifted the lid on it in the first place!.
It appears as if this is just a reworking of his own moanathon, in other words all in the public domain already, with some added spite aimed at Catherine. The assertion that she's cold, a supposition based on what? that she doesn't want to share her lip gloss or didn't throw her arms around Meghan on their first meeting. Nevertheless, she's not the one with a trail of discarded relationships, family, friends, dumped husband, disgruntled members of staff. As for the King advising other members of the family not to trust Harry, well pretty understandable under the circumstances, I mean why would they when every conversation may be twisted to fit the Sussex narrative of "their truth" relayed back in yet another interview.
It's not as if Charles, Camilla, William or Catherine can respond to what now seems to be a constant stream of one sided gossipy trash! Personally, I think they are playing a blinder, just going about their duties and ignoring all of it!