So, display out from USB-C cable is not display signal over USB 3.x digital signal, it's just an electronic analog patch-through to GPU. The pins in the port actually run raw DisplayPort signals when that feature is activated. So you can't plug a laptop to a server and get nicely packetized screen frames out over the USB host hardware. This is often not clearly communicated...
You can put a USB to RS232C or USB to Ethernet adapter behind the port to then expose ttyS0 or to serve a management webpage, that could happen, but I think the DB-9 and/or RGB would have to stay in that case.
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So, display out from USB-C cable is not display signal over USB 3.x digital signal, it's just an electronic analog patch-through to GPU. The pins in the port actually run raw DisplayPort signals when that feature is activated. So you can't plug a laptop to a server and get nicely packetized screen frames out over the USB host hardware. This is often not clearly communicated...
You can put a USB to RS232C or USB to Ethernet adapter behind the port to then expose ttyS0 or to serve a management webpage, that could happen, but I think the DB-9 and/or RGB would have to stay in that case.