I think its just because as a comment it looks pretty random and somewhat off topic since its a summary of the article instead of an opinion on it.

I think most of the time people dont add a comment to submissions, but if they do its more of the form: I found X interesting because of [insert non obvious reason why X is interesting] or some additional non-obvious context needed.

In any case, i don't think there is any reason to worry too much. There was no ill intent and at the end of the day its all just fake internet points.