I think it's fair to say that there's nothing, at _all_, remarkable about a computer beating a human on a buzzer.

As anyone who has experienced early video game consoles can attest --- even the <2MHz CPU of a NES is far more than fast enough to beat a human at reaction time, which is what makes it all the more impressive when humans do things like https://news.ycombinator.com/item?id=38841080