it's conventional to leave these out to preserve anonymity during the peer review process; if one is available, it will be added in the final published version if it's accepted.
this article is still unpublished and was only submitted for peer review yesterday!
I also like papers with code, but linking an author’s github in a blind conference submission wouldn’t make a ton of sense.
What does blind submission mean?
In this case the review is, mostly (chances are the area chair knows who is who), double blind meaning: the reviewers don't know who the paper is written by _and_ the authors of the paper don't know the identity of the reviewers.
Well, if reviewers want to know, they most likely will be able to make a good guess, without even using any social engineering trick.