This is no longer true as of Podman 5 and Quadlet?
You can define rootless containers to run under systemd services as unprivileged users. You can use machinectl to login as said user and interact with systemctl.
You see, my issue with this is that it suggests using the quadlets with lingering users... Which is the same annoying case as with the article. It is not as with other systemd services that you just instruct systemd to take a temporary uid/gid and run the service with it.
You can define rootless containers to run under systemd services as unprivileged users. You can use machinectl to login as said user and interact with systemctl.