Well, I think the torque peak on that 700 twin is probably around 4000 rpm, with hp peak probably up around 5000-6000 rpm somewhere, depending on the model and how tired out it might be.
So, in any case, shifting around torque peak might be okay for normal riding, but for performance riding it would be a lot more productive to shift up at hp peak.
I may have misunderstood the description and he may have meant shift when he feels the power curve flatten-off, which is a valid technique, and which may have been better interpreted by others above, than I did. But if the valves are floating anywhere near torque peak, then they are dead, and need new. The bike should rev to hp peak for performance riding. And the valves should not float until beyond that, because floating the valves at any rpm is bad for the cams and valves and valve gear(among other hazards), and should be avoided. It's not necessary or desireable to ever float the valves. The valves should be fully controlled by the springs in every range of operation, right up to the max redline.