I wonder if they just started on codepen with a random snippet, that so happened to have an old jQuery, and then went on with it. I've done that before, where I find a codepen snippet, and iterate over it, without caring for what versions used on it.
This was really made in 2016. I hacked it together back then, and forgot about it. Now I needed to check what did I do yesterday, and I remembered that I once made this tool. It needed just a quick update of the authorization header.
Since this is missing on github, i thought it could be useful for other people. :-)