A simple search on github reveals that those functions were reposted verbatim thousands of times, most people just copy and paste snippets of code they find useful, ignoring licenses. This highlights how all the power a license promises to hold is completely fictional. Any "in the style of Tim Davis" modifier only shows some kind of unwarranted self-importance complex on the part of the guy, thinking his style is widely known and distinctive (it's not). It's not the job of Copilot, the team that builds it, or the programmers that use it, to determine where the functions that were reposted thousands of times under all kinds of licenses originated.
This is the same case as with copyrighted photos in newspapers, a paper prints a photo somebody allowed them to use, but then it turns out that person did not have the right to use it in the first place. Did not stop newspapers from printing photos at all.
Here are the search terms:
https://github.com/search?q=cs_transpose&type=Code