So. The original guide from NVIDIA was incorrect and not allowing remote gamestreaming properly. I used TCPView and figured out the extra port needed was TCP 48010.
Hope this helps anyone with the same issue since NVIDIA's forums are blowing up with people unable to access remote gamestreaming from anything other than their local network.
Hope this helps anyone with the same issue since NVIDIA's forums are blowing up with people unable to access remote gamestreaming from anything other than their local network.