So I came to this conclusion - the best way to be 100% safe, is to block all servers but those that the teamfsd updates come from. So I sniffed out their update server, realized it was on the same server their homepage is hosted on, and came up with the idea of using these commands in my linux based router (dd-wrt) for my firewall.
iptables -I FORWARD 2 -m mac --mac-source 00:22:48:00:00:00 -j logdrop
This will 'drop' (block) all outgoing and incoming connections from/to your console's MAC address (much safter than using only LAN IP, this could for some reason change at any time whereas the MAC address will not) unless the server is teamfsd.com. It will also add the dropped/accepted results to your log so you can see just what is going on. This is although quite advance and you need an iptables compatible router (you'll need to ssh in). Bear in mind that FSD could start using a different server for its updates, but if this were to happen, I will re-sniff the new server and update you all here. Change your MAC accordingly.
I hope people understand the gravity of this issue.
i think this is the best solution so far. but how to make it permanent in the router and how to edit like if i want to play kai xlink, how to add it up.