Only true if your general argument is still in line with the HN zeitgeist. You are allowed to disagree so long as you dont disagree on core topics. HN has the same problem reddit does in that a voting system in general necessarily introduces censorship and lack of diversity of discussion. While people here don't karma farm (or karma guard) as aggressively it takes almost nothing to end up shadowbanned/instant-flagged/etc for having a disagreeable standpoint.
In other words, as long as you aren't right of center you can disagree all you want. Even a trivially libertarian viewpoint is met with significant ire.
Voting systems in general are a massive problem in social media. They don't stop the truly bad actors but they drive away the exact thing that prevents you from being caught in an echo chamber (of which HN is an example of).