The rate they are posting new articles on random subjects is also a pretty indicative of a content mill.
In 3 days they've covered machine learning, geometry, cryptography, file formats and directory services.
To be fair, not only is this not strictly impossible, you're assuming that they've not been written already and this is just how they're being released.
Not saying you're wrong, just looking at alternatives.
I had to look up what a content mill is. I'm not one, I think. It's "random" stuff because my interests are different. These posts are not written sequentially, I've been working on them (except for this MicroGPT one) for weeks and only publishing now.
Addendum - now they've changed the dates of several articles retroactively, to increase the spacing.