Of course, Hanks videos trained all these models, so that's not actually surprising to anyone with a brain.
If it's a single sentence, then you don't really have to explain anything about how it happened. There are countless reasons why a single sentence might sound like AI despite being written by a human.
I personally don't agree with the rabidly anti-AI people, but I do think their perspective is important, because there is a real possibility of some worst-case outcomes here. Without the zealots, I think a lot of people would simply ignore things right up until the point that they lost their jobs.