that doesnt work in the clinic if you claim bikes are better now;
No, but it still makes a difference, though it might sometimes be exaggerated by the people involved in order to hide something else that's going on.
I'm not suggesting, and I don't think anyone else were either, that Felix or Kipyegon are totally clean now or that they were 5 years ago either, but Aimar16's reasoning was simply all over the place. Doping is not always the sole explanation for faster times/higher level.