No, no IP addresses are stored.

Here is the database schema: https://github.com/stackernews/stacker.news/blob/master/prisma/schema.prisma

Not sure about logs though. IP addresses may appear there if they are not explicitly disabled.

But even then, you can't trust a service to have absolutely no information about your IP address since IP addresses are required for the internet to work. Hence the name: Internet protocol

So if you really don't want your IP exposed, use a proxy or VPN.