The actual state of self-hosting on a VPS

I recently ran into a claim: Docker Compose is outdated and K3s is the king for my 1Gb VPS. At the same time, docker-compose.py is effectively deprecated, with Compose now shipped as a built-in docker compose command. That alone is not a problem, but it raised a reasonable question: has the role of Docker Compose actually changed, or is this just noise from the Kubernetes church?