Allowing it has the exact opposite effect, the athlete herself is worthless and it becomes a competition of who has the better drug cocktail or is more willing to sacrifice their health. There's nothing arbitrary about this, it destroys the very essence of what athleticism is about. It's as if we allowed chess engines at chess tournaments.
The actual point of this has of course nothing to do with sports:
"He said that the data would be “very useful to determining compounds and therapies to extending human life.”"
It's yet another typical Thiel supervillain-esque attempt to turn himself into Leto II.