We've got 93 tips questions. 61 of those also have the code-golf tag. I suspect that actually all 93 of them (or at least 90) are actually tips for code golfing. So this seems like fairly inconsistent tagging practice, and I can see why there's confusion about it. It would be nice to decide how to use tags together with tips.
The main arguments for including code-golf is that tips could in principle be about other challenge types. So it would be good to see from the tags what kind of help the question is actually asking for.
The main argument against including code-golf is that it is intended to indicate a challenge with a fixed winning criterion and so non-challenge posts shouldn't get the tag.
I think I am personally in favour of starting to consistently include the tag, and hence make challenge-type tags also mandatory for tips question, but I'd be very interested in further arguments for and against including it, as well as the general community opinion.