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Claims around JPEG XL have always been wild. E.g. this from one of the creators https://x.com/jyzg/status/1592811472073416704

That's.. horrific. How can someone be this out of touch?

… are you all reading that as a serious statement, not a joke (possibly in poor taste, but still)?

Yep. Look at the replies. He's challenged on it, and doubles down. It's not a joke.