It’s called doping only if you are caught, otherwise it’s just pushing the frontiers of nutrition and science. We have no reason to think that Gidey takes performance enhancing drugs below the detection threshold any more than most elite runners. If there were a magic invisible super-drug, it’s unlikely to remain available only to (relatively) poor East African countries, so it’s an equal opportunity sport.
Going by how often Gidey seems to have exercise-induced nausea, one could speculate that she takes something just before the race that gets “used up” during the race down to near-undetectable levels and puking out the rest clears out all evidence, but it’s just that — pure speculation — because if this tactic worked, others would employ it too and it would soon likely become unusable anyway as the anti-doping agencies get smarter; they really aren’t stupid and have a huge huge incentive to keep the perception of clean sport intact.
As for arguments about how she could run the last 10K of a 15K at WR speed or significantly faster than her PB a couple months back, they are hardly conclusive. Distance running has always been somewhat counter-intuitive: runners sometimes fall and still win the race, but it’s entirely possible that if they didn’t fall, they may not have won. With pacers, you can stop to pick up a dropped drink or deviate from the shortest blue running line and yet not lose any time at all. Hills are usually harder but it’s possible for a net-zero elevation to feel easier for some runners’ bodies compared to others. Genzebe Dibaba ran 1500m in 3:50 and you’d think she could have run 109m more meters in 20s breaking the WR but her best mile time is 4:14 something and Hassan holds the mile record at 4:12 something.
The simplest explanation for this 15K is probably that Gidey pushed herself to near breaking point and that is what made her sick right after. Gidey is also different from other comparable runners (like either of the Dibabas, Hassan etc.) in that she has no final kick and seems utterly incapable of increasing her pace beyond her calm pace but her calm pace is already pretty aggressive and maybe she has just figured out how to maintain it for ever increasing distances.
