I keep seeing this assertion and I keep responding "Please, point to the volume of writing with this specific cadence that has a date prior to 2024" and I keep getting... crickets!
You're asserting that this is a common way for humans to write, correct? Should be pretty easy, then, to find a large volume of examples.
I wouldn't know how I would search for examples. I guess you'd have to search old reddit comment threads or something. But yeah, I have no motivation to do that, tbh. It could be that it's hard to find examples because they are scattered about in countless comment threads and single posts on countless platforms. Things I rarely keep links to, things nobody indexed on a large scale before LLMs.
It may be that it wasn't a very popular style of writing, because most people don't like writing a lot and keep their texts on the internet short. LLMs exaggerate this style because they generate exaggerative amounts of text in general. The style wasn't particularly annoying in the past because it wasn't that popular. It's annoying now because LLMs flood the internet with it.
The quoted example in particular didn't appear uncanny to me. And it still doesn't. I can see myself writing like that. I'm sorry I have no example for you. But I'm genuinely unsure whether I'm oblivious to the patterns others see, or whether others see patterns because they want to see them.
My counter is that I don't find examples of this type of writing prior to 2024; not with the same frequency of "tells" per paragraph, at any rate.