I read Tyler’s book and don’t recall him saying that quite so directly. It is surely true though.

I met him at an unsanctioned/non-UCI race he showed up at during his ban but before he came clean. Weird experience, he obviously won the race and most people were supportive but it was such a weird scene. You could practically feel the tormented aura of guilt/shame/embarrassment coming off him. IIRC he had won that race as an amateur prior to doping as well.