If you set up the nonguix channel you need to add the nonguix substitutes
Oh my—AH! YES! I haven't done that! No wonder why installing makes my laptop go burr.
Uh, how do I do that?
Update:
Oh, wait. I see a missed a bunch of info on the nonguix readme: https://gitlab.com/nonguix/nonguix
Also, the manual about substitutes: https://guix.gnu.org/manual/en/html_node/Substitutes.html
Thanks for pointing this out!