Remember the reivew we read of "What Katy Did?" The non-reader sister who threw the book across the room and said "Katy Did Nothing!" This sounds like the sister of the person who wrote this review--a non-reader with unusual talents.
I cringe at the thought of an edited, homogenized version of any book, forced into an artifical mold based on "age group." If a kid isn't mature enough to read the book, let it sit till they are. I read "Gone with the Wind" when I was twelve and "The Agony and the Ecstasy" not much later. Glad no one thought of dumbing them down for my "age group."