I agree it is somewhat close to the study, but we are not sure, because it is not known how much is really boring dull marketing copy. In choosing blog posts from pre-AI times I suppose you might have difficulty finding the worst examples, and might accidentally get higher quality work.
>Using the Wayback Machine, we collected 2,250 blog posts from 268 B2B company websites that were written before ChatGPT existed
Not sure what metric was used to determine these 2250 blog posts? But there are certainly a lot of ways they can select higher quality posts by accident.
on edit: evidently the Jochen from the study, maybe they thought your comment was AI written.