That it also coded it up itself is pretty amazing, but it's overshadowed by the false more amazing claim that it invented it.
I haven't tried to replicate the author's journey, but in my experience it requires a considerable amount of hand-holding. e.g. Functions will be stubbed out, but contain no logic.
I was able to guide it through a "playable" flappy bird, bit it took several revisions where I pointed out what was wrong/needed to be done before it truly returned a functional error-free prototype.
It felt like pair-programming with a promising and apologetic junior dev.