Yes, it certainly seems you have two choices.
Be mad at him and force him to release the original 540 page book he promised which will be cut down drastically
Or you can get the 1030 plus page book with part (somewhere around maybe 700 pages) in physical book, and the rest in an e-book. With an option to pay a bit more to get that third book also in physical copy.
Personally I am not happy about the delay this being the second one since it was first offered up as preorder a few years ago then never came out. But if it gets me a better book with more of the story (and I am also backing and getting Pleasance's book) I am not that unhappy to start threatening lawyers.
Have to remember, its not like he has a track record for defrauding us. He published and released the original version that I always felt raced through the Amiga and Commodore closing part. Due to that, I want to see those parts now given as much space as possible to give us a full accounting of those times for those of us who lived through them but with no internet had limited information about the behind the scenes goings on.
