The availability of /e/OS versions can differ between the downloads for manual install and the OTA updater.
This is correct. There’s a known security risk … LibreOffice Viewer security vulnerability.
It’s a system App included in /e/OS up to /e/OS 1.5, which explains your trouble getting rid of it.
This App was removed from /e/OS in version 1.6, see the release notes at Releases · e / os / releases · GitLab .
… (reference for others reading along, the additional -k option keeps the corresponding App data and cache directories around after package removal)