That's only true if Amazon chooses not to funnel money that would normally be paid out in affiliate commissions into another advertising channel. Amazon's affiliate program isn't operated out of a sense of altruism.
"Amazon's affiliate program isn't operated out of a sense of altruism."
Oh I know it is. The blog in question is essentially one giant Amazon ad pitch (I have never seen that many affiliate links on one page). However if the argument is "well the person just wanted to review the book anyways, and why not them get the money instead of it padding Bezo's pockets", the position falls apart: If they aren't being incentivized by the affiliate links, then Amazon might as well save that money.
But of course we all know that such blogs are heavily incentivized by such affiliate commissions. When Atwood decides to pitch a particular product that what do you know he can cover with an affiliate link...it isn't accidental.