I have seen the book, and I can tell you as a long time French player, and having skimmed that particular section, that just like any other book on the exchange, it goes under the assumption that Black tries to force asymmetry, and feels that he's in a must win situation.
If Black goes for a symmetrical defense (one of the few openings where it actually works), White gets absolutely nothing, and he even has to be careful. By Black forcing White to commit first, he commits to the wrong thing and it becomes a weakness for than a strength and then it's White fighting for the draw.
Probably the most common one that I get is 1.e4 e6 2.d4 d5 3.exd5 exd5 4.Nf3 Nf6 5.Bd3 Bd6 6.O-O O-O 7.Bg5 Bg4 8.Nbd2 Nbd7 9.c3 c6 10.Qc2 Qc7 11.h3, which I don't think is White's best (if there is a best, per se). Now Black can contest the battery and White can't due to the weakening of g3.
Ever since I took up the Symmetrical Defense back in 2014 arising from 1.e4 e5 2.Nf3 Nf6 3.Nxe5 d6 4.Nf3 Nxe4 5.d3 (more common are 5.Nc3 and 5.d4) Nf6 6.d4 d5 and you have the exchange French via 2 extra moves, specifically the line 4.Nf3 Nf6, I have yet to lose in any over the board tournament game in which White played the exchange. Probably about a 60/40 split between wins and draws (that's an 80% score with Black).
So I'd think twice before taking up the exchange. If you don't want to deal with the mine fields that result from 3.Nc3, I would highly suggest the Advance Variation.
If you want good advice in the French Defense where you can see the common mistakes that Amateurs make along with a couple of GM games sprinkled in, I would suggest reading the French Connection series. The first one is at:
http://charlottechesscenter.blogspot.com/2018/03/the-french-connection-volume-1.html
and there is a menu on the right to navigate through the years and months. Move forward from March 2018 to today. There are 24 articles thus far with more to come. (And no, they are not all Black wins - Many nice wins by White are also featured).
I can't speak for the rest of the book. Just the French.
I am reading Christof Sielecki's book, and finding it easily the most useful repertoire book I've ever read. Every opening he recommends is either one I like already or one I've been thinking of playing in the future, and I will probably end up adopting the entire repertoire, with the possible exception of some of his lines against the Sicilian. His approach is really summed up in his treatment of the French. I wasn't sure at first that I wanted to adopt the Exchange Variation as my main weapon, and when I've used it in the past I have avoided his recommendation of 4.Nf3, feeling that was just too boring. But actually the problem with the Exchange is not that it;'s drawish (nearly all the pieces are on the board, so there's lots of potential for complications), but that it's featureless. There are no distinctive pawn structures etc, so it's hard to know what plan to come up with. But he is really good at mapping out the possibilities and showing how certain ideas turn up in variation after variation. This is a book I think I'll learn a lot from.