While I think his notebooks and features look pretty useful, he frames the article around having invented "notebooks" 36 years ago before anyone else, and talks about other notebooks not having features that they've had since 1987. This is a pretty odd context to basically describe a new chat feature. Is this a record that should be set straight? I've used Jupyter since it was IPython notebook, but I don't think that…
> I wrote the Notebook user interface for Mathematica and led the user interface group for over 20 years.