The author had all these massive articles all on fairly different topics ready to go... and then decided to pump 4 of them in a span of 4 days.
If it looks like a duck...
If it looks like a duck...
It isn't impossible that it's AI, but assuming writing and publishing happen at the same time would also lead you to conclude that Anne Frank wrote from the afterlife.
Plenty of people out there are happy to let AI do most of the work while claiming it as their own.