I am not sure about whether the project is brand-specific or not, however I worked on first try on a Lenovo Ideapad Gaming Laptop running Fedora. Though, my device doesn't support RGB, so I am unable to test if RGB works or not. Speaking of different brands, I think it the package will work wherever there's a backlit keyboard with operating system as Linux. I don't have a Macbook, so I don't know how to do the same for Mac.
How was RGB tested, in that case?
This project requires on-device physical RGB testing, so something like RGB in CI/CD testing won't work.