Yeah, this is one hell of a poorly sourced "article".
Not one concert or official release has referred to them as just "Stone Temple Pilots" since Chester joined. This has been their name the entire time, and it's pretty ridiculous that the site is reporting it as them "changing their name." And the "Stone Temple Pilots" Facebook page still only list three band members.
The funniest thing is that they claim it's the result of the lawsuit, even though A: there are no official results to the suit and B: this is how they've been billed since prior to the suit.
"This just in, after 18 years Dave Grohl has officially changed his bands' name to 'Foo Fighters'. In related news, Roger Daltrey and Pete Townshend have begun referring to their band as "The Who.""