For example, I can make a correct comment which has nothing to do with the thread. Irrelevant comments are infrequently downvoted. Eg, HN:ers downvote for reddit-style jokes. https://hn.algolia.com/?query=reddit%20joke%20downvote&sort=... . Even if there's nothing false in the joke.
People also downvote for tone: https://hn.algolia.com/?query=tone%20downvote&sort=byDate&pr... .
Since there are many factors which may cause someone to downvote, I don't think you can assume it was due to being correct.
Quoting from the HN Guidelines: "Please resist commenting about being downvoted. It never does any good, and it makes boring reading."
P.S. And how do you know 1928321931 prefers to be referred to as "he"?