This is a really interesting paragraph to me because I definitely think these results shouldn't be published or we'll only get more of these "whoopsie" experiments.
At the same time though, I think it is desperately important to research the ability of LLMs to persuade people sooner rather than later when they become even more persuasive and natural-sounding. The article mentions that in studies humans already have trouble telling the difference between AI written sentences and human ones.