Unrelated, but could you please stop creating accounts for every few comments you post? We ban accounts that do that. This is in the site guidelines: https://news.ycombinator.com/newsguidelines.html.
You needn't use your real name, of course, but for HN to be a community, users need some identity for other users to relate to. Otherwise we may as well have no usernames and no community, and that would be a different kind of forum. https://hn.algolia.com/?sort=byDate&dateRange=all&type=comme...
I'm not a mod, but they almost certainly track the IP addresses of people who create accounts. It's basically impossible to do spam prevention otherwise.
I think that most people don't have static IPs and then there are proxies and VPNs... I don't think that IP is a meaningful identifier. From my experience IP bans never really work, except maybe for range IP bans, but then you might affect other users too and of course you could still circumvent it with a VPN.
I once created a throwaway on HN for something sensitive, and I happened to be on a VPN at the time. My comment started out dead and I had to vouch for it on my main account.
So I think that's just the tradeoff they make, in order for HN to be able to exist. It probably gets reversed if you email the support link.