Not sure, but i pressume so. Anyway, all those are my assumptions with no concrete evidence of who it is connected to. But i do know that my MBP 15 2017 stays connected to 2.4 even though i sit infront of my router after coming out from the room.Cool but does your phone jump to the faster 5 GHz automatically after being on 2.4 GHz when you move nearer to the router?
If i keep them separate the MBP will always be connected to the 5