I might be wrong about this, but I think that kernel-devel package is specific to Fedora or other RPM distros, and the Arch equivalent would be linux-headers (which you should already have). I would just install those two other packages, git and dkms (git is probably already installed) and try to plow through the rest of that tutorial starting from here and see how it goes.
Please, start reading the arch wiki.
Next, black arch is for for experienced users and is not supported by the Garuda team, nor is dual boot or your specific hardware.
Besides, I miss your garuda-inxi which was required by the template.
Am reading the arch wiki now. Sorry for missing the template requirement, will make good on meeting it in future forum posts. Thank you for the link to the wiki!