I'm getting a mixed reading, the most egregious flags aren't present, but there are a couple.

As you identified there is a lot of parallel sentence structure.

They also have a bunch of lists of 3-5 items which is a classic.

It doesn't have the anodyne rambling never getting to the point style common to LLMs

I'm starting to feel that this line of reasoning has turned into pseudoscientific divination. And it's really unfair to writers who put effort into blog posts.