I already answered this in the very same post -- doping is not necessarily PED:
"PEDs unambiguously provide PE. The ambiguity is determining which drugs are PE, for whom, under which conditions."
Back to the drawing board. wrote:
What I have argued is that we do not yet have a strong correlation between doping and elite male distance running performance.
Bugger!!! And I thought performance enhancing drugs ("doping") were called performance enhancing drugs because they improved performance.
So for ten percent they have negligible benefit, thus in your world they must be placebo.