Does this work with the Steamdeck?

No it does not. It does not send enough power

does the display off type-c alt mode work for USB3.2 hosts?

The Host connection on the USB4 Dual 4K Multi-Port Hub will require USB-C port that supports Thunderbolt 4, Thunderbolt 3, or USB4 from a computer. The USB-C 3.2 Gen 2 on the Hub supports data (10Gbps) + DP 1.2 support. That port is the one closes to the USB Type-A port. Supports up to 1 external display when connected to legacy USB-C laptops or M1 Mac.

Will this work to power and recieve display for Nreal Air glasses?

It's possible it may work if the glasses has an equipped USB-C. You would connect the the USB-C to the USB-C port that says "DP/USB4 10 Gbps" on the Multi-Port Hub. However, the Multi-Port Hub must connect to a host such as a computer, tablet or mobile phone that supports Thunderbolt 4, Thunderbolt 3, or USB4 (DisplayPort Alt mode and Power Delivery must also be supported as well).

Does the hdmi work as an input also?

no, HDMI only works as an output. I don't think that exists for a hub. Any monitor or screen is input only and any computer is output only. The only reason for an HDMI input is if you were plugging this into a monitor or tv, which is not what a hub device is used for.

USB4 Dual 4K Multi-Port Hub - 5 in 1 USB4 Hub, Dual 4K Display (HDMI, DisplayPort, or USB-C), USB-A, 2 x USB-C Ports, for Macbooks, Windows Thunderbolt 3/4 Laptops (JCD401)

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