Thanks for the thread.
I can't see that it would have been any other way. IDLE after touchdown makes sense to keep the thrust levers from adding power by holding them aft. There is no way the aircraft would have been certified if it went to SPD on touchdown. We know the autothrottle disengages at reverse selection which would of course, blank the associated FMA indication. Going to IDLE at 25 feet is exactly what it does during an autoland but thinking about it, I doubt the autothrottle has any idea how whether the autopilot is engaged or not so it just does its thing as usual.
I think that the only thing that happens below 2'(or whatever the very low altitude is after a certain number of seconds is that the TOGA switches are deactivated meaning...manual advancement of thrust levers for the go-around.