The only thing they have proved is their willingness to game benchmarks. ATI and NVidia were gaming 3DMark 10 years ago.
Also interesting to note, though Samsung is definitely more than willing to game benchmark despite their protests (and looks like the worst offender by a pretty long shot), Anandtech found out they're far from the only company doing so: http://anandtech.com/show/7384/state-of-cheating-in-android-...
Edit: turns out this was mentioned in the article, but the way it's presented, what the fuck Guardian?
> Anandtech, a site where you could get the (wrong) impression that benchmarks are the only reason to own a gadget