I have ridden in teams in which doping was systematically organized.
There are still lots of possibilities to cheat, without anybody proving it. Transfusion with your own blood, growth hormones, artificial haemoglobin. Right now you have to say: Only the dumb ones get caught. Or the poor ones, who can't afford the expensive doping.
So, what teams has he ridden for:
Telekom 1998 - 2000
ONCE 2001 -2003
Liberty Seguros/Astana 2005 - 2006
Not very "clean" company
"Systemically organized." So what else does he know? Other than Telekom, which we know about, although they all deny there was an organized effort, where else?
His last statement is probably the most telling and sad: only the dumb or poor riders get caught.