Walter Isaacson, the book's author, gave a long-form interview recently on The Lex Fridman podcast. In case you'd like to form your own opinion about the book's legitimacy, its writing/Musk-supported research is substantially discussed:
Musk has since stated that the satellites were always disabled in the Crimea, as per requirements of US sanctions, and that SpaceX would have turned things on if requested by the American government, but no such request was made. Is he lying?