Thanks, I sort of assumed this was Jeff's elementary-school-aged child. I even had an androgynous, towheaded, smiling image in my mind. ("MacKenzie" is a rather androgynous, and dare I say infantilizing, name.)
Well of course I didn't click through to read it. I was just trying to imagine why so many people cared about what someone in the Bezos family thought about a book about Bezos, and I figured it must be, "aww, what a talented little kid, that's so cute!"
Which says nothing about the person at whom they're aimed, but considerable about the person who made them -- and such assumptions as these say nothing particularly complimentary.
Politics, nothing -- someone who can read a review such as the one Mrs. Bezos wrote, and not once question his assumption that a 13-year-old wrote it, has extremely sloppy habits of thinking at the very least.