I think this is best explained by there being a stricter standard of avoiding taboo topics for main compared to the comment section.

The post wasn't downvoted at first actually although it was commented on, and I didn't downvote it, but it was sent to oblivion after the first high status commenters arrived saying he was political, low status, discussing a taboo topic to disgrace LW on purpose, a troll.

I have made arguments about as controversial as the ones in your linked article in comments on pedophilia and they have generally been well received. The same is true of my arguments in favor of there being a hereditary component to the measured racial differences in intelligence.

You have a reputation. I bet it helped.