Correct me if I'm wrong but it seems like sshd on RHEL-based systems is safe because they never call syslog.

They run sshd with the -D option already, logging everything to stdout and stderr, as their systemd already catches this output and sends it to journal for logging.

So I don't see anywhere they would be calling syslog, unless sshd does it on its own.

At most maybe add OPTIONS=-e into /etc/sysconfig/sshd.