That discussion is outdated. Current Nvidia drivers support GBM, and thus should work with wlroots. Their status of unsupported mean that the wlroots maintaine

That discussion is outdated. Current Nvidia drivers support GBM, and thus should work with wlroots. Their status of unsupported mean that the wlroots maintainers cannot help if it does not work as they cannot debug a closed source driver, making it impossible to see what might be wrong. General improvements that help nvidia compatibility are accepted though if other's identify an issue.