Yes, the comment has it backwards.

> Also, how are we encoding “current node”? Is it an integer? Does A=0, and the rest of the nodes have some arbitrary value? How do we calculate `neighbors(node)`?

This is the "discussion" part of the interview where you're supposed to ask, and the interviewer will tell you that you can assume the nodes are numbered from 0/1 to N-1/N. I imagine the adjacency modeling is up to you since you'll be judged based off what representation you pick, and that will depend on the proposed solution.