I think they've given up on the book.
I don't think it will ever see the light of day, and this is all a performance for the benefit of squiggles.
It's been gone from her twitter bio for a while now and I haven't seen mention of it in any of her recent articles or appearances - has she?
It's quite clear from her social media activity that the book is not getting worked on. Most of the recipes supposedly going into it are already on her site. The ones that are 70% in her head aren't fit for publication - they haven't been tested.
(Just to note also that she shared a crowdfunder recently which is to help a disabled person with a house deposit.)
Call me cynical, but this is all part of the game. Who would honestly be posting lightheartedly about pringles when they have a book already well overdue that is is no fit state for submission?
Nah, I think the book is not happening. Neither this nor the poverty tome.