If I were to wager, I’d actually say mechanical doping rather than physiological.
The game theory of it makes the most sense to me given other options.
so much time/energy is spent on biological passport/testing/etc whereas I doubt they are looking at mechanical doping with the same level of seriousness.
The riders wouldn’t even have to know.
You don’t need a massive power boost to make a huge difference. 20W for long enough in a pivotal moment.