> What about screen-readers? I don't think he thought this through.

yes, what about screen readers? Screen readers get a well-thought-of menu of accelerators to existing features of the website. If the website is well coded, this can even be one of the website's own, displayed menus.

What is there not to like?

Instead, by embedding it in random meta elements, screen readers have to download the useless code (as does every other browser out there) and can not use any of it.