Definitely ask him about that, then!
I know there can be two cases
1) the artist themselves do sometimes put their content through content ID to "enforce" the creative commons license (in which case, there is a usually a process by which they will release the claim very quickly when disputed...(I can't link, but if you search for Dexter Britain's site, then go to "Information", then "AdRev and YouTube", he has a section on his site explaining why he uses a third party for content ID, and how you can get those claims released.
or
2) As I suggested before, if the artist themselves do not put their content in Content ID, then what can happen is that someone else can use that music in one of their songs (or even just steal the creative commons music itself and make no adjustments!), put that in content ID, and then that would be content ID matches that the original creative commons license holder can't really do anything about.
I think if you ask, you can probably find out which is which. If it is number 2, then HiFi should definitely see if he can manually get that fixed with youtube because that's just not right.