My favourite alt text on Lemmy

The alt text doesn't help, can someone explain the joke here?

How did the alt text even get in there? I don’t find anything when I do exiftool -a -u blah.webp or magick identify -verbose blah.webp

Edit to add: oic: The “Alt Text” field doesn’t appear in the post form until after I upload the image.
https://github.com/LemmyNet/lemmy-ui/blob/0.19.5/src/shared/components/post/post-form.tsx#L627-L646