Also thought it was a joke. Absolutely not signing in to google for an unknown app meant as a novelty, and I can’t imagine that’s necessary for this to function so I think it’s fair to say it’s a bad design, if not outright malicious.
It looks sketch and this is the kind of thing that could really benefit from a small explanation. Users land on what seems to be a joke/novelty website that is immediately asking them for google login information, with no explanation. As you can see from the reactions here, that did not go well. An explanation of the reason for the login would help a lot.