For whatever reason, I can't reply to your comment further down. I'd be perfectly happy to follow them on another platform if their tweets were piped elsewhere.
In case you happen to read this, that is (presumably) due to an anti-flamewar feature on HN, which hides the reply button for the first few minutes of posts in deep comment threads. You can either wait to comment, or comment by clicking the "X minutes ago" text next to the commenter's username.