I'm pretty sure it's been the case since at least 7.0, as I've done it a few times on hosts such as Scaleway that only offered a Debian base image for my machine.
Somewhat annoyingly, Proxmox relies on a non-Debian kernel for at least some of its features. This definitely made a difference w/ Bookworm (which was on the 6.1 kernel release series), not sure about Trixie (which will be on 6.12).