While such a thing would be warranted with five single-issue submissions a day, surely before you raise these kinds of implications you ought to consider that the facts that they post an average of less than five submissions a week and couple them with obviously-human comments would suggest the submissions are manually curated by a passionate individual.
Idk the policy culture here to that much detail though, I moderated one completely different and much smaller site from 2016-2018 and was glad to stop doing so by the time it ended.