Sorry for the shitty quality, I used my phone camera (no capture card). And yes, I hacked my NES Classic Mini, but that's not on topic.
The console has indeed some kind of input lag when connected to a LED/LCD TV. But I've been able to beat the game many times on it, including Mike Tyson/Mr. Dream. And keep in mind I'm not even that good at the game: I just play for fun. So people who are really good at this game can certainly do it even better. It's just that they haven't really tried it that much.
I only wanted to prove that this game is beatable on the NES Classic Mini. So... there you go.