I looked for a transcript, but to no avail, but I've found a way to download the whole thing.
Might take some time though. Nevertheless, it seems like it's only been mentioned by Warne himself. To my knowledge he didn't front any courts, and I certainly don't recall any time during the process or after where it was established that his taking of the diuretics was categorically unrelated to masking any other substances. I mean, that's the point of masking agents, innit? That you won't detect what's underneath. Still, it'd useful to know if that was the case, though it has a fair whiff of bull**** about it to me, I have to say, and the part of your post I've bolded doesn't really make the case at all.
If it's just a matter of not being caught out in previous testing, that's probably not very relevant. I think the main suspicion is that Warne would have taken something to speed up his recovery from injury rather than it being a case of long term ongoing use for better performance during games (it's questionable that banned substances would greatly assist him in this regard anyway).
Anyhow, I guess I'll come back to this when I've watched the interview.