The silence and relaxed demeanor of the peloton should tell you he isn't using motors and they accept his superiority. Watch the interviews of other riders. If they knew Pog was using a motor I'd expect some kind of strain in the way they speak. But there is none. They are all tranquille. And if I was a pro I wouldn't want to be gifted races.What annoys me is the silent of the peleton. Back in the LA era riders knew they couldn't win TDF, but they had a fair shot at any other race. With this Poga dude there's nothing left, nothing. He gives no stages away, remember Jorgensen in last years TDF. That was totally unnecessary. Poga takes everything, other riders must feel horrible, they must know what's up.
And, assuming he isn't simply a generational talent, if its not motors, then it can only be methods all the other teams have access to. But what they don't all have access to is Pogacar's response to doping. So the wheel turns back to the effectiveness of the UCI biological passport.
We already know doctors use EPO micro-dosing "top ups" to hide blood doping but I am not convinced that is foolproof. The 14 markers tracked by the ABP include all ways that the blood transports oxygen to the muscles that generate sustained aerobic cycling power. Others here know more than me. But I think the answer will be in there somewhere - again, assuming he isn't simply a generational talent.
Its all here under 2.1.1 Haematological Module: