keyboard and usb-c

[irongarment]

Presumably you mean this part:

Can I plug something to the phone's Type-C port?

    No! When the keyboard is connected to the phone, it powers the phone by internally supplying 5V to the VBUS of the phone's Type-C port. So if you connect another USB power supply to the phone's Type-C port, it's like connecting two chargers to the phone by cutting and splicing their cables. (Likely not a good thing, or something you'd consider doing if it was presented to you that way.) If you connect some USB peripheral there that only consumes power from the port (like mouse, unpowered dock, etc.), it may work (in theory), but only if you make *absolutely sure* the phone will not enable its power output to the USB device! No distros ensure that at the moment. When you plug USB periperal it's the same as plugging in two chargers into the same port, without additional software support that doesn't exist, yet.

That doesn't say the USB and pogo pins are the same. It says that the 5V pogo pin is used as an input to the phone to power the phone from the keyboard power circuit, not as an output from the phone to power an external circuit from the phone's power circuit.

It's also not very well written, and therefore a bit ambiguous. I would expect to be able to plug a USB device, but not a power source, into the phone's USB socket with the keyboard connected.

I suppose I could test it as I have the HDMI/network dongle that came with the phone.