It is. It's not the only possible treatment, and it might not be the best treatment for everybody, but his doctor concluded that it was the best treatment for his condition given his lifestyle. Somebody else might get different advice, e.g. avoid holidaying in France in July to avoid the triggers so that you don't have to risk the side effects of this powerful drug.
What might look dodgy would be shopping around until he found a doctor who came to that conclusion, because he wanted that treatment in preference to others for reasons not connected with therapeutic effectiveness. Nobody seems to have offered much evidence that this is what happened, but if it was then it certainly would be the first time somebody has done that.
his doctor concluded that it was the best treatment for his chances of winning the Tour De France given his need for performance enhancing side effects
It is. It's not the only possible treatment, and it might not be the best treatment for everybody, but his doctor concluded that it was the best treatment for his condition given his lifestyle. Somebody else might get different advice, e.g. avoid holidaying in France in July to avoid the triggers so that you don't have to risk the side effects of this powerful drug.
What might look dodgy would be shopping around until he found a doctor who came to that conclusion, because he wanted that treatment in preference to others for reasons not connected with therapeutic effectiveness. Nobody seems to have offered much evidence that this is what happened, but if it was then it certainly would be the first time somebody has done that.