Well, i have to agree his efforts in RVV do seem "outlandish". But, unlike Van Aert in PR (who paid the price for his chase in the final 15k yet until then looked like the strongest rider in the race), van der Poel did have actual help from his team in the chase, and the tempo in the front group wasn't "full gas" the entire time.
However, RVV was 275k long. So it seems almost too good to be true. Usually any unneeded waste of energy in such a race will cost you.
On the other hand, like i stated earlier, he's been like this since he was a kid. Was he doping age 12 and up? When exactly would he have started? He wins 32 CX races a year, is now winning high profile RR as well. He rides MTB as well. There won't be many riders that get tested as much as him.
If there is something there, there is no way Adrie isn't in on it. As a father, i don't know how you could do that (being a former rider and doper), knowing that at some point in the future, chances are it will come to light, and that you have put your child in an impossible position. And again, wouldn't you race in a less conspicuous manner?
I don't know. I'm still onboard with him being clean. On the other hand, i've been following the sport too long to be surprised anymore.