SunRed [1] filed a deletion request for amdvlk-2023q3.3 [2]: With amdvlk being discontinued and official vulkan support for old gpus coming through radv, this package isn't needed anymore. Additionally it doesn't compile anymore without some major fixes.
[1] https://aur.archlinux.org/account/SunRed/ [2] https://aur.archlinux.org/pkgbase/amdvlk-2023q3.3/
