I think she is talking about hyper not hypo salinity which is higher salt content. As far as I know, fish don't like hypersalinity as it causes their internal systems to work harder to regulate it. Hyposalinity on the other hand is less stress on the fish, and also kills the parasites like ich (not velvet).
Every time I used hypo treatment in QT, I was 100% successful. The only QT failure for me happened late last spring when I QTed new fish, but did not do the hypo routine. That was because I also had bought new shrimp and snails at the same time. The livestock looked fine after several weeks, so I then transferred them to my display tank. It took another month or more, but then I had another full outbreak in my display tank. I ended up losing 2 fish in my display tank, but ironically none of the new fish. Eventually, the ich subsided on its own, and all is well again in my display tank.
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