The question of whether the current generation of "AI" can think, whether it is conscious, let alone whether it can suffer(!), is not even worth discussing. It should be obvious to anyone who understands how these tools work that they don't in fact "think", for even the most liberal definition of that term. They're statistical models that can generate useful patterns when fed with vast amounts of high quality data. That's it. The fact we interpret their output as though it is coming from a sentient being is simply due to our inability to comprehend patterns in the data at such scales. It's the best mimicry of intelligence we've ever invented, for better or worse, but it's far from how intelligence actually works, even if we struggle to define it accurately. Which doesn't mean that this technology can't be useful—far from it—but it's ludicrous to ascribe any human-like qualities to it.
So I 100% side with Dijkstra on that point.
What I'm criticizing is his apparent dismissal and refusal to even consider it a worthy philosophical exercise. This is why I think that the comparison to submarines and swimming is reductionist, and ultimately not productive. I would argue that we do need to keep thinking about whether machines can think, as that drives progress, and is a fundamentally interesting topic. It would be great if the progress wouldn't be fueled by greed, self-interest, and manipulation, or at the very least balanced by rationality, healthy skepticism, and safety measures, but I suppose this is just inescapable human nature.