While the author is trying to sell this book as a 'documentaty' I suggest reading From Time Immemorial by Joan Peters.
Or you can only read books from authors whose history you want to believe.
Given the upheavals that occurred during WWII the Palestinians seem to be the only people wedded to a past situation. Millions of Germans were thrown out of the Sudentenland and present day Poland and guess what? There are no groups in Germany asking for their property back. Millions of Jews were tossed out of various countries and guess what? They have created new lives. The Germans tossed out at the end of WWII have become normal German citizens. The Israeli's have built a creative thriving nation. The Palestinians have been damaged by the idea they are going to return to their homes in mandate Palestine. Things happen but life goes on. It appears Muslim countries would rather have refugees instead of them becoming citizens. What a wasted time for Palestinians.