Guess you missed the part in the graphic showing the network cable
was not connected...

I had taken that one off broadband to update to the Merlin 386.5 Beta 1 firmware and captured the screen cap that field to show that it
IS there. Here is another showing traffic once brought back up with the 386.5 Beta 1 firmware. (Its a low speed broadband line, the reason for the low DL/UL numbers.)
View attachment 39718
View attachment 39719
Edit to add: That RT-AC68U's Operation Mode is configured for:
Wireless router mode / AiMesh Router mode (Default). No AiMesh or nodes attached to it. Only running YazFi and YazFiDHCP on it.