I have replied to the comment on the AUR page with the reasons why this package was created. Rather than copy it here, here's a direct link to that reply:

It's been suggested that I adopt and update the existing package which I'm happy to do, but as that would break the package for existing users guidance is required on the correct approach to take.

From: notify@aur.archlinux.org <notify@aur.archlinux.org>
Sent: Monday, August 16, 2021 3:05:10 AM
To: aur-requests@lists.archlinux.org <aur-requests@lists.archlinux.org>
Cc: tbperrotta@gmail.com <tbperrotta@gmail.com>; sshaikh@hotmail.com <sshaikh@hotmail.com>
Subject: [PRQ#27597] Deletion Request for i3blocks-contrib-install-git

thiagowfx [1] filed a deletion request for i3blocks-contrib-install-
git [2]:

https://wiki.archlinux.org/title/AUR_submission_guidelines:

> Check the AUR if the package already exists. If it is currently
maintained, changes can be submitted in a comment for the maintainer's
attention. If it is unmaintained or the maintainer is unresponsive,
the package can be adopted and updated as required. Do not create
duplicate packages.

How is this package different from i3blocks-contrib-git?

[1] https://aur.archlinux.org/account/thiagowfx/
[2] https://aur.archlinux.org/pkgbase/i3blocks-contrib-install-git/