:) The irony here being that the WTFYWPL license is generally not advised for projects that actually care about making it easy for others to use the code, it is itself a little bit of a joke license used to forcefully make the point that the author doesn't care about the copyright and is not interested in suing people or arguing about ownership.

So it's appropriate in this context, but also pretty easy to argue that 10 lines of code are not a serious copyright threat anyway, and that it's not clear what code on this page is even subject to copyright in the first place, and that the author might have gone all the way and leaned into the fact that you don't really need an entire Git repo with a license for a single HTML page.