What does "the latest Arch Linux" mean? Arch Linux is a rolling distribution. It was patched in the repository on 2023-02-02[0].

[0] https://archlinux.org/packages/core/x86_64/openssh/

I assume they mean the latest version available for download as an .iso, since I think that tends to happen around monthly. I agree that this isn't super concerning though, since even installing from that would result in an up-to-date system, and there isn't much reason to ssh to or from the live disk.