Among the SSH fingerprints listed on the site there isn't one for the FreeBSD server.
Please confirm, whether or not the 2048-bit SSH key has a following SHA-256 fingerprint:
Iua3vKMMVRrXeUXEkSMs8JaPZ9oK06sqtYVlV8Qm9pA
MD5 fingerprint:
e1:ac:e3:2c:c4:d1:e5:9d:ed:e9:1a:e7:e5:2c:ed:f6
This information needs to be public, or at least available to the PUBNIX users.
fingerprints are published for bsd.tilde.team as SSHFP records, and you can tell ssh to check with the VerifyHostKeyDNS option.
i'll see about getting them added to the site footer
tildeteam@lists.tildeverse.org