This is an incredibly biased article, hinging entirely on the assumption that AI training is fair use.
There's a notion, which seems to have taken off among creators who are paranoid about AI eating their livelihoods (which it might eat a chunk of) that copyright prevents people from doing anything with works they [legally] acquired other than personally read, listen, or watch it.
That's not how copyright, as it has existed in the past, works. You can do all the algorithmic processing of your ebook collection that you want. You might be able to display small portions of a book to others, depending on the situation.
Quoting one or two paragraphs out of an entire book seems like reasonably safe fair use, but that won't stop a copyright-maximalist creator (or their publisher) from suing you, and won't stop some copyright-maximalist judge from ruling against you, so it's probably best to minimize the amount of content from a book that you redisplay directly. But you can do all the analysis and statistics generation you want, and display those results to others.
It remains to be seen what judges will do with AI generation of works based on ingesting gigantic amounts of copyrighted work. The entire framework of copyright is going to be broken, and until Congress steps in and changes it, judges are going to go every which way. There's no bright line for 4-factor analysis; it's always been a gut-level "is this a reasonable use that doesn't impact commercial sales too much". There's no possible rational way to draw a line. AI models can generate a painting of a new subject only loosely in the style of a contemporary painter, which would not be copyright infringement, or it can generate a near-clone of an existing work with the right prompting, and depending on how clever the prompter is, a lot of intermediate stages of likeness. Who decides how close to an existing work is too close?