It wouldn't really matter; the image includes a lot of structure that isn't present in the text that KaTeX provides. A text-only screen reader will never produc

It wouldn't really matter; the image includes a lot of structure that isn't present in the text that KaTeX provides. A text-only screen reader will never produce anything but gibberish if you feed it KaTeX output. KaTeX will also style the text so that it visually resembles the image, stopping this problem from occurring for non-blind readers. You could have a screen reader that parsed all of the layout, but it seems like you might just as well OCR the image at that point.