I'm no astronomer trying to have work published, but wouldn't a mistake like that be one of the most obvious things to attempt to test your own work against before releasing the results? Is the fear of releasing an obvious mistake and the damage to one's reputation just not present anymore, or is first to publish so critical that mistakes are forgiven? To me, if I was going to present a paper that goes against existing conventional thinking, I'd want to make sure my paper stood up to the most rigorous review including (especially?) from HN commenters.