That is not what this is about. That's an old demo, using only the documented features of the LCD. As far as I can tell ~everything on there is done using the standard charset and the 8 customizable characters.

There is no demo for what this article talks about; it kind of ends in a cliffhanger and it seems the author hasn't quite gotten to the implementation stage yet.

I kinde of see that screen shaking it's head at the end of it going "WTF just happend" like it's waking from some crazy dream it just had. That's not what I'm supposed to be used for at all!! Sort of like it was just given the choice of a red/blue pill

That's an old demo from 2013.