There obviously should be a point past which you can't make a razor any sharper. I would bet for most people that before you reached that point the razor would become uncomfortable to shave with. So really it does not matter if you can eke out the last bit of sharpness from a blade or not because it probably would not be usable.

I think Jimmy alluded to it in his post when he said "That razor got so sharp by the time I got done that you touched it to your cheek with any pressure/carelessness and you were cut. That is probably the sharpest I ever got a razor. Very like a Feather DE blade and I'll never deliberately do that again." To me that is way past the sharp you need for a smooth comfortable shave.

At the bottom of the post you want to quote there is a reply with quote option if that is what you mean.

Bob