I wouldn't say that... I think it does well making the point that you can just simply judge a frame on if it is steel or aluminum. Other factors like geometry can play just as big a role (if not bigger) in the ride quality of the frame. Case in point... I owned two NJS frames, own a couple of aluminum track frames, and a tigp-welded steel one. The two NJS frames were by far the harshest rinding out of the bunch. The aluminum frames (both same model) definitely feel stiffer under load but at the same time have a more positive ride. The tig welded (and double butted) steel frame is the smoothest riding of the bunch but not as snappy either.

I have sold countless low end cro-mo and aluminum track frames and to be honest they all have a pretty harsh ride but none of the good stiffness of a higher quality frame. But you get what you pay for... A high-end frame is going to ride better than a bare knuckle or soma, which is going to ride better than a surly, which is going to ride better than an IRO or brassknuckle... that's just life.

But back to the OP... I have ridden all the IRO fixed gear frames and out of the bunch I would pick the Mark V or Angus if for no other reason than the finish quality of the dropouts and the design of the fork crown is 1000 times nicer than that of the Jamie Roy.