No, ARC is listening on port 55000, but there’s no UPnP port forwarding rule in place in your router. I think you’ll need to manually set a rule to forward port 55000 traffic to your core’s IP address.
In your Gigahub rules create a new rule, call it Roon ARC or something, internal 55000, external 55000, then set the IP to your core’s IP - 192.168.2.43.
Hopefully that should work.