This happened with 'chrome is bad'[0] where someone anonymously registered a new domain complaining about Chrome's updater taking up CPU, but the comments later pointed out that it most likely was just a bug in activity monitor[1].
It seems the only reason for doing this instead of having a personal site with multiple blog posts is to spark debate while keeping a zero-repercussion way out in case the internet/HN determines that the situation is more nuanced than what the blog makes it out to be, or when it's outright incorrect on facts.