AppImage still just works, just like tarball bundles without dependency on 3rd party infrastructure and overengineered solutions like snap and flatpak.
I haven't watched the talk (yet), but I use a number of app images and they have always "just worked" and in remarkable fashion. My only complaint is that you sometimes have to write the .desktop yourself if you want it launchable through the UI, but that's a fairly trivial objection.