The upvotes on the current post are fine - the reason you saw the submission rise in rank is that startup launch posts by YC startups get special placement on the front page (this is in the FAQ: https://news.ycombinator.com/newsfaq.html). Not every such post does, but some do.
In other words, your perception wasn't wrong, but the interpretation was off. I've put "Launch HN" and "YC W26" back in the title to make that clearer - I edited them out earlier, which was my mistake.
As for the booster comments, those are pretty common on launch threads and often pretty innocent - most people who aren't active HN users have no idea that it's against the rules. We do our best to communicate about that, but it's not a cardinal sin—there are far worse offenses.
In other words, your perception wasn't wrong, but the interpretation was off. I've put "Launch HN" and "YC W26" back in the title to make that clearer - I edited them out earlier, which was my mistake.
As for the booster comments, those are pretty common on launch threads and often pretty innocent - most people who aren't active HN users have no idea that it's against the rules. We do our best to communicate about that, but it's not a cardinal sin—there are far worse offenses.