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It’s maybe not quite performance enhancement, but it certainly removes a restriction or decrease that otherwise may have occurred. A grey area indeed.
Definitely a grey area in terms of sporting ethics, but then so are all TUEs, whether individual or the global one for salbutamol. On the other hand, the regulation turns it into a hard black and white boundary. As long as the regulation is what it is, you'd have to be a particularly aggressive Corinthian to refuse treatment on ethical grounds.
Philippa York on this:
https://www.theguardian.com/sport/2017/dec/14/chris-froome-team-sky-drug-test
I enjoyed the 'explication' bit, possibly a result of speaking a lot of French? :)