If the ideas are not complex enough to warrant a long explanation, it is a failure of the writer to be unable to produce the same information more succinctly.

Its not about short-form content, its about the unneeded over verbosity being a sign of a failure of communication.

Following Grice's maxims of communication, you can infer that they are either poor communicators or worse trying to hide something.

It takes a few words to communicate an idea; it takes a lot more to defend it. Which one is the blog post in question trying to do?

I'm a really slow reader. Had some hilarious conversations with fast readers. They really enjoy fluffy low density content. I ask what is on the page they just read and their first reaction is to look at it again. I describe barely related thoughts I had reading the page, the character of the author from their choice of words, they look at me as if I've done just the thing you aren't suppose to.