The author had a rather colorful post to /r/emacs that has been edited significantly since, but some of the color remains in the comments: https://www.reddit.com/r/emacs/comments/oapa2l/help_building...
Regardless the author and I disagree strongly about the actual usefulness of Copilot. I do think ML could be a huge boon for many human applications, like coding, but it's far far from it. Furthermore Copilot's specific implementation seems to leave much to be desired[1].
To me ML is an infant right now and we're metaphorically and literally expecting that infant to drive a car. ML is in a weird, weird place.
[1]: https://twitter.com/mitsuhiko/status/1410886329924194309
Worse its not even a license forever, nor even for a period of time. It's priced by the word.