I rather enjoyed that chart too Priest. Alice is shock rock but that I'm sure if there was a synonym to "shock" that rhymed with "metal" then that's what they would've gone with back in the 70's when they labeled the Alice Cooper band.
On a sidenote I was kind of caught off with the "pop metal" section of that chart. Considering the acts placed in it I was surprise The Crue wasn't there and was very surprised to see Gun N' Roses and Van Halen in particular to be considered ANY kind of "pop" just because they were successful. Also I was pleasantly surprised to see The Darkness squeezed in at the very end there because I didn't think most people cared about them that much, even if I'd never call them metal.