Under the assumption that amazon has decided to astroturf on this niche tech news site, that is still okay and allowed to do as long as the article provided is interesting. There are countless posts here which are just blogs from various companies, sometimes posted here by the companies themselves. Meta, Apple, small startups, movie companies, whatever. It's all allowed here as long as the content posted has substance and is interesting, thats all. What's important is that the comments are productive and interesting and not being used as a soapbox, which is likely why your parent comment is negatively voted. There are countless platforms for you to suggest others not see a movie, but a hn post about astrophotography is not that.

That proves nothing. You are making assumptions. Did you look at the submission history of the poster?

HN runs on user-submitted posts. People submit things they find interesting, and things they believe others will find interesting.

I don't think I have ever submitted my own work to hn, but I'm not astroturfing what I do submit.