I meant usually descriptively rather than proscriptively. Having just read the link for the first time though, confirmation in the traditional sense is a red herring, because Eliezer obviously doesn't mean confirm in the traditional sense. My apologies for side-tracking the discussion.

To get back to your original point though, what I take Eliezer to be saying in that linked post is that an experiment is necessarily just as much an attempt to disconfirm the theory as to confirm it. If, then, what you are actually doing is trying to "confirm or disconfirm the theory", and there's no way to set up an experiment that might confirm but couldn't disconfirm, then it's more accurate to say that you are trying to "test the theory".