OK, myx is a mainstream music channel who caters to "pseudo subculture" music... along with publications like Pulp magazine...
having said that, yes they are not reliable, and they are only good for entertainment purposes, not as a source of reliable musical information.
and IMO, tose bands they mentioned are not poser metal, they however have elements of metal that are sooo far diluted, they shouldn't be considered metal. let us just call them "pop rock" bands... that would be a better definition, considering the amount of records they sell.