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.
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.
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?