It's not as simple as BUT HEY DEY IZ NOT A METAL BAND. Neither of those two are "metal bands". Doesn't mean they havent released songs/albums that dont fall under the metal umbrella. Same goes for metal bands releasing stuff that isnt metal. Doesn't mean they're not a metal band anymore or whatever. Both of those bands have plenty of heavy and metallic songs scattered on nearly every album ive heard from them so i dont see anything wrong at all with either of them being mentioned on peoples lists here.
"they belong", "if enough people think they're a metal band"... were not ranking bands here, were ranking albums.