Here's the thing. There may be something more to his statement, like the fact that the PS4 shines in alot of ways, and that 8 gigs of ram is a huge step up from our current gen, but he's still wrong, and he will always be wrong, and I will tell you why.
Right now, Sony's working with ATI to create a graphics processing solution to power their newest console. Even if it's the best of the best they can muster, that GPU is going to be on the market, and if it isn't, the technology will be.
So, no, the PS4 will not outpower the top of the line gaming PC. However, it will outpower your average, 400 dollar laptop by a longshot.
Actually, that's what you'll be getting when you buy a PS4. A discounted, ATI powered computer with some in house firmware and some tight restrictions. Dollar for dollar though? Yeah, the PS4's more powerful, especially if, to get just the GPU (not CPU, mobo, psu, cooling solutions) on a PC would probably cost twice as much as the console retails for. Some people aren't willing to pay that much more for the freedom to use their device as openly as they wish, though.
In other news, the Nvidia 700 series cards are supposed to come out soon. Shut up and take my money.