I think in this case it still means that; the unexpected meaning is just being used ironically. :)

And thank you!

That's a really interesting question. And yes, Hermione would only know if she realized that the potion was now suppressing something different. However, she could probably test this by taking a little less of the potion in one dose and seeing what happened.

Harry thinks, at least, that the feelings he hates most are unlikely to change.