I'm starting to think that a way we can easily filter what's being heavily composed by (SOTA/mainstream) LLMs or not is by how "polite" the public sees their published blog post.

If everyone sees the post as "polite", most of it probably been written by LLMs, as they remove anything that could be seen as "nonpolite" and human. Meanwhile, engineers who just want to publish their own thoughts and feelings on a subject, will be filled with stuff the public sees as "nonpolite", and since those hard edges weren't trimmed before the publishing, we can then assume this is actually a genuine person's thoughts and feelings.