> This confirms that our machine is receiving all updates until 2027

I believe the author is mistaken here; they are receiving updates only for "main" repository, and not for "universe". The example "ffmpeg" package belongs to "universe".

The UI seems bit confusing because it doesn't seem to show what the version available through ESM/Ubuntu Pro would be, but exploring the repository manually shows that for example for ffmpeg there is "Version: 7:4.4.2-0ubuntu0.22.04.1+esm2" available, a different version than what is available in the standard repositories.