Fair point on throwaways. I always call them throwaways out of lack of taking the time to think on what else to call them. "New accounts" feels wrong, even though technically accurate, as it can cause conflation with "new users". "Anonymous account" might be better phrasing for this case? I don't know if there is a more established term you/others use for accounts that hide community identity though. If there is please drop it in a reply so I can use that in the future.
However much I disagree with their reasons I don't necessarily think their comments make for bad discussion here or steer things in off-topic direction. A debate on what exactly this experiment is providing evidence of is good and healthy discussion of this article regardless which interpretation is correct, with those disagreeing the most likely to provide the critiques to consider. While they certainly aren't neutral positions (or ones I'd consider logical) that's not necessarily a mark of what's bad discussion or an excuse to announce I thought their comments were jokes/peddling. To us, some ideas offend, viewpoints alarm, or strike us as extremist - we don't have to treat those positions as neutral or valid but we should treat them kindly instead of always assuming the worst and commenting about it separately. That, ironically, is actually a distraction from discussion on the article (if you make a sincere Ask HN post about it some may be interested though).