Absolutely, it could. Which is why I said it was only at least 50% likely. I'll take something at face value until I'm given a reason not to. I know pessimism is kind of a religion around here, but just because you can imagine rain on the parade is not proof of it. It does appear to have a date. It also appears to be labeled "HQ" which has a certain likely connotation with this band. None of that would stand up in a court of law, but nothing is at stake. If we take the file name at face value it seems to suggest the recording is from Hanover Quay in February.
I say the vocal sounds quite recent. It's a hard thing for anyone to put their finger on, but I grade that as Bono's post-360 voice.