I think of ghostwritten celebrity books the way I think of celebrity lines of clothing or perfumes. Sure, it’s possible some of them actually did the creative work, but most of those products are someone else’s creative skills combining with the celebrity’s name and influence to sell it.
So without actually knowing the details of that contract/agreement/situation, unless the writer’s been stiffed in some way with a bad or broken contract, you don’t have to worry about the writer not getting “c...