That's an appeal to authority. I think the comment you're responding to is valuable, even if the person writing it has no credentials and is themselves biased.

That's an appeal to authority. I think the comment you're responding to is valuable, even if the person writing it has no credentials and is themselves biased. Explaining reasons why the author might be biased gives me useful information. If we say "that's bad because they're biased too and also not a researcher", we're essentially saying "We don't want to see any contradiction to research articles published on HN".