Wut docker swan never went away, I used it everyday. It was a misleading blog post made by some tech journal, which blew docker-ee dropping swarm in favor of another orchestrator.
Ce still has it.
It still exists but there is zero development on it. They left it in a kind of half finished state imho with some pretty annoying gaps in the workflow around updating configs/secrets, one time tasks, etc. There's zero future or updates in its roadmap: https://github.com/docker/roadmap/issues/175