So Ubuntu has this model where they pretty much freeze package versions for an Ubuntu release after release, and then they only backport security updates from upstream. There's nothing new here, most distros do it this way. The idea is that this way they can polish the gazillions of package versions
It is not. The headline is completely inaccurate.
Nothing has changed for LTS at all. Scroll down to the pretty graphs on https://ubuntu.com/about/release-cycle, and pay particular attention to how the ratio of orange to purple on the LTS graphs has changed over time. (it hasn’t) The base LTS support window has always been 5 years, and the extended window has always been another 5 years.
What they did add was additional security updates for Universe packages, which are represented by the black line. Note that this black line is independent of the LTS coverage. From https://discourse.ubuntu.com/t/ubuntu-pro-faq/34042:
You can also dig into this AskUbuntu answer for even more details, but the long and short of it is this has no impact on Ubuntu LTS whatsoever. Keep using it if that is your thing. Keep using something else if it is not.
Edit: This old news will become newsworthy if Canonical starts shifting packages out of the main repo and into universe, which would in fact reduce the security update coverage of LTS releases. That said, the article has not asserted any evidence of this. Nothing to see here…for now.