Bell curves are probability distributions. This is a time series, so it can’t be a bell curve. It just has the same shape.

Are you discarding the utility of Gaussian functions in analysis simply because the independent variable is time? A Gaussian curve can be used as a descriptive model without claiming that the observations themselves are a probability distribution

The fit does not prove causation, but it does show that the decline was already well described by a trend that began years before generative AI. If the claim is that 2023 created a separate structural break, it's different claim then the title describes

You can't call it a bell curve unless it's from the Charles Murray region. It's just sparkling statistics.