Additional Network Ports for Multiplayer Gaming: HDMI Ethernet Channel support on Xbox One X?

I do not believe it does.

If this is a feature that you would like to see, let's have you leave feedback
here: https://xboxideas.uservoice.com/

Yes mate the Xbox Series X will have an optical out port, 2 HDMI ports, 2 USB-C port, Ethernet

Ports required to use Xbox Live

These ports must be open for Xbox Live to work:

• Port 88 (UDP)
• Port 3074 (UDP and TCP)
• Port 53 (UDP and TCP)
• Port 80 (TCP)
• Port 500 (UDP)
• Port 3544 (UDP)
• Port 4500 (UDP)

Note Some game developers require you to open additional ports. You should always check the game developer's website to see if the game you're playing needs additional ports to work. We've gathered some ports you might need
and have added them to the
Additional Network Ports for Multiplayer Gaming forum.

If you're connected to a network through your workplace or school, ask the network administrator to open these ports.

If you receive a NAT warning when you connect to Xbox Live, see the
Xbox One Multiplayer Game Solution

The Kinect Sensor gets plugged into a USB port, not a HDMI port with the help of the adaptor which must be purchased separately...

How to connect a Kinect Sensor to Xbox One X

they are normal HDMI ports, they just have additional features. ARC is audio return channel, MHL is for streaming sticks