Bit too much FUD here.

Traditional antivirus software does not detect protocol-level misuse.

I don't think it ever did... you'd be looking for a (N)IDS for that function

I don't use either application, but I suspect that most of this theory could be used on Jabber clients too...

It's a novel way to do recon, but you'd already need to know much more about a target to be able to use the data.

But... good to know about.