IMO it looks a bit like a spam link, the domain kind of looks like a random string. The *.pw also raised my eyebrows because I rarely see that TLD (I realize you may be from that country but that doesn't change my first impression). Can't say I know for sure why you were downvoted but I was a little hesitant to click on that link.

People do, usually with direct links to the HN pages or to a search on hn.algolia.com - most likely it's suspicion about this new domain that's obviously linked to the account that posted it.

Interesting strategy. Submit a popular article and use it to advertise your “previous discussion” tool by using the usual HN convention but with your link instead.

Very growth hacky. I quite enjoy the trick, including generating the controversy with this seemingly naive response.

I love it, actually. Definitely a good marketing hack.

Usually the "previous discussions" comment is posted with links directly to the previous thread(s). It would probably be received better if you mentioned that this is your site in the original comment.

Whether or not the site is useful, the comment feels misleading in this context.

Might have been better if you said that upfront.