Updating again! The technology of signing messages via Ethereum hasn't changed (needs a private key, and results in a long hexadecimal data "signature"), but different organization structures keep evolving on top of them. Here's that same message signed using the Ethereum Attestation Service (EAS): the whole signature is encoded into the URL of this link:
That's less readable as a human, directly, but it adds several additional bits of data including the time the person signed it, whether the signer is allowed to undo their signature ("revoke" it), and what the purpose of the message is ("Make a Statement" in this case)