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The White House wants to 'cryptographically verify' videos of Joe Biden so viewers don't mistake them for AI deepfakes
(www.businessinsider.com)
This is a most excellent place for technology news and articles.
No, all you need for this is a digital signature and to publish the public key on an official government website. And maybe for platforms like YouTube and TikTok to integrate check status in their UI (e.g. flag any footage of candidates that was not signed by the government private key as "unverified").
How would an NFT help in any way?
I was being glib, but as NFTs are (typically) images signed by a blockchain, it meets the criteria of "cryptographically signed image" in a way.
In reality, you are correct.