Eat This fails to be on NY Times List

http://www.publishersweekly.com/article/CA6524058.html
Via Andrew Wheeler:
Publishers Weekly reports this week on the case of Dave Zinczenko’s Eat This, Not That, which is selling very strongly…but does not appear on the New York Times bestseller list. (It is on PW’s list.)
The Times sniffed that Eat This “falls under the classification of of a calorie counter book, which the Times does not track.”
As Andrew Says, it sounds like the Times is (once again) making up rules to make the bestseller list come out the way they want. They moved the Harry Potter novels off of the list, after all, in part perhaps because they consistently dominated the top spots.
A bestseller list which is overly massaged is useless as a barometer of book popularity.