I think you may be right, although they must have padding sewn into them. Which seams silly, because they basically hand-made a decent custom seat cover (decent as in craftsmanship) that they could have just made a little smaller and stretched over the factory foam (needs hog rings or similar system between the main part and the side bolsters).
If that IS hog-ringed in like a factory seatcover, then it's a terribly made piece of poo...then again, they could have just made it a little smaller, and it would look right.
Reminds me of Pimp My Ride and that hispanic dude being like 'yo, check out this custom interior, esse!' and then showing a terrible mess of sagging leather crap.