FWIW there are other answers in that Stack Exchange that, in my opinion, give a better description of the situation, and in my opinion the primary objection in

FWIW there are other answers in that Stack Exchange that, in my opinion, give a better description of the situation, and in my opinion the primary objection in that particular answer is the definition of "move". Fair enough, but I think it's still a helpful description for laypeople who are not fully versed in the math.