There is an old thriller trope in which the hero wakes up in restraints in a mental hospital being told that their past is all a delusion. It is a cliche, but it gets used often because it always works. It is a frightening and exciting premise, questioning your identity and your own memories. It works well for a character like Moon Knight who has an established history of mental illness and it is a reasonable possibility that his superhero career might be delusional.
Sadly, Warren Ellis' run on MK ended after only 6 issues, and apparently that was his intended run. This was followed by 6 issues by Brian Wood, 5 issues by Cullen Bunn, and then Jeff Lemire wrote the book for 14 issues. This volume is the start of Lemire's brief run. I offer this as attempt to help anyone trying to figure out MK's convoluted recent publication history.