Well, it could be that Penguin doesn't want another book that's one quarter truth and three quarters lies, defaming/libeling people, while whining and moaning about his rough life now.
Harry's first book wasn't the success and didn't sell as many copies as Penguin brags about. Remember Spotify. Penguin can't find another author willing to "ghost write" the book. Penguin may have told Harry to submit at least three chapters before he gets any money.
https://www.dailymail.co.uk/femail/article-13210751/Prince-Harry-isnt-writing-book-damaged-relationship-King-attacking-Queen-Camilla-memoir-Spare-royal-expert-claims.html
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