The point is that he could have just as easily suffered this injury in his home country going about day to day life, where his eyesight, balance etc. would have been just as bad. The causal link between the chatbot's flirting and his death is shaky at best. This was tragic, and also the result of something clearly unethical, but the death was still not a reasonably foreseeable consequence.

He could have suffered this injury in day-to-day life but he didn't.

Imagine you were hit by a self-driving vehicle which was deliberately designed to kill Canadaians. Do you take comfort from the fact that you could have quite easily been hit by a human driver who wasn't paying attention?