I assume the intended usage is to differentiate between tips targeting other types of challenges. On SE they have a couple of questions asking for tips in restricted source.

We have questions tagged "tips" and "code-golf", and we also have questions tagged "tips" and "fastest-code" or "tips" and "king-of-the-hill".

Does this work well enough, or is there demand for "fastest-code-tips" and "king-of-the-hill-tips"? I was guessing the separate tags for "tips" and the challenge type was sufficient, since the "code-golf-tips" tag has zero usage despite there being several questions tagged "tips" and "code-golf".

Yeah I struggle to think of a scenario in which "code-golf-tips" is anything but the intersection of "code-golf" and "tips".