I would expect the thermal plugs to melt on a rejected takeoff because the brake energy charts state that they will above a certain speed and weight. I think the point Romasik was making wasn't that the thermal plugs would not melt on a reject -- he was saying that if the brakes were so poor that they couldn't withstand a normal landing with autobrakes in medium, do they really have the capacity to stop on a reject, as advertised.
When you say that it's not unreasonable to expect the thermal plugs to stay intact during a "normal landing," would you consider a medium autobrake setting to a full stop to be a normal landing?