Most modern cameras can autofocus in perfect darkness using a small AF light. Especially at f/0.95!
But really, I recreated the shot, in a perfectly dark room with a phone light as the only light source, and it focused adequately and the image came out more than adequate at 1/20x ISO 2066 @ f/2.8, or 1/30 ISO2400 f/1.4, all with good AF.