Most of the human responses on HN can be distilled down to about a dozen "trope" answers. For example "Rewrite it in Rust" or "Patents are bad" or "Let's not turn this into reddit" or "I'm special so x doesn't apply to me" or "Zoning laws shouldn't exist", etc.
So you don't even need ChatGPT to be convincing on Hacker News. You just need a few dozen lines of Perl.