Well, he references to the incident, but doesn’t specify if the plate was really his; it could have been have been one of his subordinates who complained to him or something. Also, if it was his plate, it’s also possible that he was not the one near the microwave… The guy there could be telling you ‘WTF are you doing [with his meal] ?’
So yeah, Magnusson was somehow involved in the incident, but it’s not 100% clear, so I think this is why the team won’t place him there.
I could be wrong, but that’s what I remember reading.