I did not dismiss it. I think he made a good argument
when he made it, about computing
at the time.
What I disagreed with was not Dijkstra, but applying it to AI today given that whether or not you think that there shouldn't be anything interesting about it even with AI, the social context means that there very clearly is whether or not you think peoples beliefs around it are reasonable.
To rephrase: At the time, computers unambiguously did not in any way get even close to the line, just like a sub gets nowhere close to replicating swimming. That made the question ludicrous and the comparison a good illustration.
Today there is ambiguity with computers, but no more ambiguity with respect to subs, and that ambiguity is such that it matters deeply to a lot of people in a way the question of subs swimming never will even if you close that gap. As such the comparison has lost its utility.