From reading the actual article, it sounds like hype. The authors of the piece of the tabloid style book based the content off of over "200 interviews". More likely than not, they probably interviewed 200 weasels who were willing to make up rumors and bullshit to give the book juicy content. I seriously doubt they actually had access to Milley or bothered to interview him. And I think anyone here knows this isn't the first time one of these lame "OH WE GOT DA GOODS TELL ALL" books have been released by someone (particularly these two hacks).
I'm not saying Milley didn't say these things and/or is innocent. He's far from innocent and is clearly a jack ass who'd rather waste time going on a quest to discover the meaning of "white rage" than do anything actually competent for a joint chief of staff general.
But odds are that if this book is full of rumors and unverifiable information based off of sketchy interviews, then don't expect anything to happen to Milley based off this book.