The older Ubuntu Advantage (now Ubuntu Pro infra-only) covered the main repository only. The universe repository was not covered in Ubuntu Advantage, but was covered in the new Ubuntu Pro subscription, which was in beta so far. Ubuntu Pro entered GA on 26th Jan[1], so now these apps (in universe repo) are only supported if you enable esm-apps, under a valid Ubuntu Pro. Prior to October, these apps wouldn't have been considered supported (as confirmed by running ubuntu-security-status)
You can get Ubuntu Pro for 5 personal machines for free. The change is overall a positive, since universe is now a supported repository in ESM.
Here's the relevant snippet from https://endoflife.date/ubuntu (Disclaimer: I maintain this page, feedback welcome):
> Ubuntu Pro offers security fixes for critical, high, and selected medium CVEs in the main and universe repositories. Ubuntu Pro (Infra-only) - previously known as Ubuntu Advantage - only guarantees security fixes for packages in the main repository - other packages are on a best-effort basis.
Note that Pro only covers this for limited architectures[2], so keep that in mind.
[1]: https://www.infoworld.com/article/3686569/canonical-security...
[2]: https://askubuntu.com/a/1452498