I looked at the AIV history but I missed that comment that you pointed out (isn't there an easier way too see an AIV response than trying to find just the right diff to display?).  But this IP user is really starting to piss me off - he seems to have an almost infinite amount of time to waste having re-vandalized the page 9 times in 2 days.  So, the answer is to keep posting in AIV if the vandalism continues?  And if it really is a shared IP, then tough luck?  Seems like a lot of wasted time.  I'll go hunting to see how I can request the page be semi-protected again, at least that will give me a few days of peace...