> This follows the same style as official linux-firmware[a] which is also a VCS package without -git suffix

The Arch repo linux-firmware is not a VCS package, because that uses specific release tags, i.e. fixed versions (because of the "#tag=" fragment at the end of the URL):

source=("git+https://git.kernel.org/pub/scm/linux/kernel/git/firmware/linux-firmware.git#tag=${_tag}?signed")


But even if a repo package was indeed a VCS package, that would not be a valid reason for an AUR package not to use the needed suffix (-git, -svn etc.)

Because it is specifically the AUR submission guidelines that call for such package naming.

See here:
https://wiki.archlinux.org/title/AUR_submission_guidelines#Rules_of_submission

Cheers,
Marcell (MarsSeed)