When I find a candidate's GH profile I just check if he/she has at least a handful of repos that are not just forks that they never touched. If I really need experience in a specific language I'll look to see if one of the repos uses it, maybe browse the code real quick to see what it's about, and that's it.

I rarely dive into the code. And, TBH, while having a GH profile will get you a few points, not having one is not eliminatory in my book.