I don't totally agree that this isn't a situation that would call for Rx treatment, and here's why.
1. We don't have any idea how long the Nem was in the LFS it was purchased from.
2. We don't know if this is the first sign of deflation.
3. All of the tests I have done and threads I've seen and first hand accounts lead to the working theory right now that your best chance of survival upon first deflation is to begin treatment.
So do we know the anemone is bleached? Yes we can clearly see that, but Nems who are recovering from being bleached don't start the deflation cycle. The deflation cycle is usually the beginning of the end. We don't know 100% what causes deflation, we only know the few drugs we currently have that tend to help us weather the storm. There are times where treatment works, there are times it doesn't. Usually in those cases it's believed the Nem would have died anyways. There is a saying in the Vet industry that no animal should die without the benefit of steroids. I carry that over into my treatment of Nems and feel no Nem should die without having been given at least the best shot we possibly can to help it recover.
My working theory from my experience would be as follows: The Nem isn't dying from being bleached. Nems can live an extraordinarily long time while bleach and even fully recover. Similar to AIDs, Cancer...etc things like that, the Nem has begun the deflation cycle because of another outside factor, which is probably amplified by the fact it is bleached and doesn't have it's full immune system in fact.
Because of this I would treat this animal. I would also advise the OP to look into procedure for properly light acclimating any photosynthetic animal we introduce to our tanks as Nems are just as sensitive to lighting changes as any of our other corals.
Also just to be clear, there is no 100% correct answer here. If there was we would all be doing it and it would be common knowledge to most well informed reefers. All we can do is work off of the experiences we have personally or read about. The above is simply mine.