Yes he is, my thought is since a GT20 has minimal boost below 2000 RPM and can hold 24 to 26 PSI no problem in the mid range and all the way to red line, it really works just as well as a VNT20 wheel hybrid that is setup to limit boost below 15 PSI by 2000 RPM. The GT20 would seem to be at full chat by 2200 RPM, about the same as a limited hybrid. Since a race through the gears uses about 1100 RPM, I would think that 3200 to 4300 rpm is where the GT20 is most happy. At that range the VNT has no advantage at all, and since the GT20 has a much bigger and smoother exhaust flow from head to down pipe, I would think that the PR would be about 2.0:1 ( I have not measured it) vs 3.0:1 for a VNT with the larger .65 A/R. That is a full 26 PSI LESS backpressure and heat in the exhaust manifold. Little wonder why the UPS III has little smoke and is much faster thru the gears.
I should also add that on my PD150 turbo, race injectors, chip, no dawes, I see about 28 PSI on surge 24 in the midrange, 21 psi at redline. With dawes surge is to 24 PSI and she is flat from surge to redline at 21 PSI, with more smoke.