The package was not updated for 2 years. Upstream released several new versions in this time. The AUR package is not working for the 2021 Magic Keyboard. You have to follow the install instructions from the upstream repo.
Flagged Out-of-Date Comment: hid-apple-patched-git-dkms
Panzki flagged hid-apple-patched-git-dkms out-of-date on 2022-07-18 (UTC) for the following reason: