I don't know, that's why I'm asking...
What I do know is that Axel seems to think non-road categories should always be included, even when it's clearly only road races that are being considered.
Huh... PCS has 483 road races, but that would only leave 17 off-road wins between Pidcock and PFP...
Pidcock hasn't won many CX races, and I don't think PFP has any, so 17 doesn't sound unlikely.