You would have to read their privacy policy and decide if you trust them to determine if they track you based on your IP.
RSS works by something downloading the RSS feed. So some IP will need to connect to Reddit to fetch it. If you don't want to reveal your IP then you need to fetch it from somewhere else.
- Use Tor to download the feeds.
- Use a hosted service to fetch the feeds. However that service will see your IP and know what feeds that you are reading.
- Use a VPN. But the VPN will see your IP and that you are connecting to Reddit.
- Use a proxy. But the proxy will see your IP and what you are fetching.
So basically yes, fetching an RSS feed will be associated with an IP address (like anything else across the internet) so if you don't want Reddit to see your IP address you will need to get something else to connect to Reddit on your behalf.