Actually, it looks like the poster found that in some content (not necessarily anything we wrote) domain accounts weren't being specified with the domain name prefix, with op=equals. In a correctly written interpreter, that would indeed cause nothing to be found, so he is saying the content needs to be updated.
You're correct, in our interpreter it doesn't cause a failure, which is wrong. It normalizes the name to an extent... (it seems to add the domain name prefix, but not normalize the capitalization of the account name part). The item shouldn't be collected at all.