Hi Deenial!
Sorry I have been busy. Here is your issue:
The Default Gateway is just the connection to your router in your home. So your test is only testing the connection between your computer and router. This is not going to help test any In-Game Connections.
To gather the correct IP you will need to follow:
You will know the test is working because you will see Many different connections in the test.
I hope this finds you well.
EDIT: Here is an example of what a healthy scan should look like.
https://us.forums.blizzard.com/en/wow/t/huge-lag-spikes/840744