Well, I've tried to make this point before, and got slammed for it, but I'm a gluten for punishment, so here goes:
First off, this guy's equipment is hardly basic crap. Any reasonably modern DSLR will be good, especially when paired up with a fast prime. In terms of what it will allow you to do, the difference between his camera/lens and a top DSLR is far smaller than the difference between his camera and a cheap compact, so even though it's not the latest and greatest, in the scheme of things he does have good gear.
"A great photographer can get a great photo regardless of the camera, a poor one can't despite the camera" is true, but is only part of the story. IMHO, the equipment does matter. A great photographer will get great pictures out of an iPhone and out of a 5D MkIII, but they won't be the same pictures. You can do everything that's possible on the iPhone with the 5D, but it doesn't work the other way around.
Perfect example; this shot by the guy the OP linked to:
http://flic.kr/p/dSUkGP.
There is no way, regardless of skill, that that shot, with it's very narrow DoF, could have been taken on an iPhone. It's merits are NOT all down to skill; the camera selected is critical to it. And if that's the kind of image you're striving for, no amount of "practice with the camera you have; it's not the kit it's you" will help.
So yes, that guy is really good, and sticking to the camera/lens combination he has has probably honed his skill, but having a "better" camera, and especially a wider range of lenses, would open up possibilities for him to apply his skill to a wider range of photo styles.
Kit doesn't make you a good photographer. But kit does allow a good photographer to do more. Simple as!