https://snapcraft.io/podman looks as if that snap was existing – in reality, it doesn’t (and, technologically, can’t; podman needs privileges that snapd for the foreseeable future can’t expose to snaps; this is like asking for a snapd snap) exist.
It cannot be found through the snapcraft search.
Since search engines still index it, people are misinterpreting this to believe podman is snap-packaged.