But "just pack" actually also triggers the whole build. Zipping is just the final step. See "pack: build" in the justfile.
So that's what happens in the git version of the aur package.
The non-git version just pulls the extension authors zip that he built via GitHub actions.
So I'm confused. You wanted to delete the non-git version of the aur package and seem to be confused about what happens in the git version. Maybe you flagged a wrong package?
I still don't see a valid reason to delete any of them. Granted we fix the version you seem to have an issue with.