After cloning the repository and moving the .ttf font files to my ~/.fonts folder and then running fc-cache -fv debian applications that require monospace fonts are unable to see the font (eg: gnome terminal, gVim).
I can verify that Debian does not recognize the ttf files as monospace by running fc-list :spacing=mono | grep -i courier and noting the omission of Courier Prime Code in the output.
I will note that just the regular Courier Prime ttf font files in this repository do not have this issue.
Debian and linux kernel version:
Operating System: Debian GNU/Linux 12 (bookworm)
Kernel: Linux 6.1.0-17-amd64