So what are you suggesting? That the Walkers or PRH have bunged this doctor a significant sum of money to write a positive review in a publication distributed free of charge to a little over 4,000 neurologists in 2020, by which time the book was already an international best seller? A review which, at best, would have generated sales in the low double figures? A review that wasn't picked up by Wikipedia until earlier this year, 5 years after the review was published and 7 years after the book came out?
And, unlike you, I don't see the review as "oddly favourable". He clearly liked the book. He uses a common saying ("when you hit rock bottom, the only way is up"), albeit one that some on here seem to object to. He links it to recently published scientific papers suggesting that physical exercise can benefit some patients suffering with degenerative neurological conditions. And says, "there can be life, even when there is no cure", so he is definitely not buying into the idea that going on long walks somehow cures TW.