Why?
Though, they do say “these patterns aren’t usually deliberate”.
But even being aware may not mean you really deeply understand why you have a problem.
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The alternative reading, where an entire exchange cleverly takes place without any substance, seems almost mistaken to me? In context it seems very clear it's "I thought you...[were going to say something.]" "No." "Ah."
One reason that it is funny is that it plays against that.
We the audience maybe forget for a moment that we are not watching real life. We are watching a drama or entertainment. So we expect something relevant to happen. That’s the convention.
The exchange plays with that expectation. It deliberately forces us out of our pleasant illusion and makes think us about our real experience - we are sitting in a seat and watching a performance, which is happening at that moment.
And nothing happens, just the same as real life
This story has used other titles, like - What We Lose by Letting AI Speak for Us
https://wikipedia.org/wiki/Roman_graffiti