Save 2003, Ullrich's Tour results and performances weren't really any better after 2002, when he supposedly started doping again, versus 2000/2001, when he was supposedly clean. So if what Pevenage is saying is true, then doping didn't seem to have much effect on Ullrich (if anything, again with the exception of 2003, Ullrich didn't ride nearly as well after he supposedly started doping). Or was everyone clean save Armstrong in 2000/2001 and the rest only started (or re-started) doping again in 2002? Not likely.
And he won Olympic RR gold and ITT silver (2000) and World's ITT gold (2001) while clean? Also not likely.