I think he (Clarkson) said the ride was awful, and the steering odd. He attributed the former to the bigger wheels.
As the suspension deals so well with high frequency bumps (pot holes, catseyes etc) independent of speed, but doesn't move on low frequency bumps (camber changes, undulations etc) until you're doing 40+, I think we can reasonably suggest that the well-'ard springs might have more to do with it than sidewall compliance (or the lack thereof...).
I think his column is now less about motoring*, and more about 'lite' entertainment.
*(from the person who once - justifiably - criticised Judith Hahn for completely missing the point)