Definitely seems sketchy to me. I doubt there are any huge secrets not available from SDN/Kaplan/TPR/anything. I think the AAMC works very hard to make sure the test is objective, and that there are no huge surprises or secrets.
I don't wanna enter the legal wonderland of slander/libel, so you'll have to read between the lines.
I ordered the secrets... (got it as a gift). I'm happy that I didn't waste...oops..."spend" my money on it. It's long, but 1/3 or more of it is a glossary, and gives tips like "when you guess, make it a random guess".
I did spend my money on EK and the thick Kaplan book, and I'm glad I did.
Best of luck.