RussBell describes it as "relatively advanced and thus more suitable for the experienced, intermediate level player and above".
In the introduction of that book (page 11) it says:
"at this stage (2000 FIDE) we should move to the second phase [of endgame study] ... I intend to devote this book to the second phase..."
So it is not intended as a first book of endgames.
In the same introduction, the author mentions Philidor and Lucena positions as belonging to the first phase of endgame study (ie: before the phase his book focuses on), and something I read recently (I think it was in one of Dan Heisman's books but I can't find the exact section right now) Heisman mentions being ~2100 FIDE when they lost a game due to not knowing the Philidor position. Their point was not that they should have known that position, but that it occurs so rarely in games below that level that they were able to reach that rating without knowing the position.
Which is my my long-winded way of saying it's not written to be an introductory endgame book, and would not be a good choice. Stick with the Pandolfini or Silman ones.
100 Endgames You Must Know by Jesus de la Villa
Any opinions of this as a first Endgame study ?