You want the "board" selection to match your actual board. It shouldn't matter if the com port has the wrong "guess" about what kind of board you have - that's just info based on the USB VID/PID. It is easy for me to imagine a board that has been configured with the wrong USB info (especially if it's a clone of some variety.) But it shouldn't affect uploadability.
I'm not sure whether the IDE propagates the "guess" from the "port" setting to the Board setting; make sure it shows correctly in the lower right corner as per Bob's video. Perhaps re-set the board type AFTER selecting the port.