I dont think the “expert” takes into account how heavy those Vodka bottles are. Those things are heavy af and thick, so her throwing it and it smashing against his finger will forsure cause the injuries detailed.
With these things it could have been that one in a trillion perfect storm moments. Just the right angle, speed, velocity, and whack, the tip comes off.
With the broken bottle and everything else going on, I think he’s telling the truth. And no Artist would ever injure either of their hands. But if someone was angry with an artist, what better place to hurt them? That could have ended his abilities to create art had it been any worse. And it was traumatic enough. Psychotic really.