I work with publishers as a side gig and I never saw any announcement surrounding this guy's book. Normally a publisher will issue a release and then do some advertising if they've paid a high premium for a book deal, because they need to recoup the investment which tells me this guy honestly didn't get anything (it's possible it could be under the table, but the industry is normally very upfront with how much they pay these people.) When you see a press release regarding a book deal like ACB's, that is called and "advance" - the author gets paid up front and the publisher keeps all proceeds until the advance is paid for, then the author can start getting royalties. But 95% of authors do not get an advance and most of the ones who do get something small like $10k, usually for nonfiction to help offset research expenses.

TLDR: people quoting Q on "lucrative book deals" don't know how the industry works for the small potatoes.