GitHub's disabling of TLS pre-1.2 means that (purposefully) old dev/test boxes will switch from https:// to git:// for their git pulls. If GitHub continued to offer TLS 1.0/1.1 on a hostname called "insecure" or such, it'd send the same message without triggering such downgrades.
How would recent ssh be needed? Are you thinking clients so old they only speak ssh1?
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No, not that old - just non-overlapping sets of ciphers on client and server. Recent OpenSSH sshd disabled and later excluded some legacy ciphers.
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