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This is untrue, at least as a sequitur.
Deceleration does not add any heat to the spacecraft. Stress, yes. Heat, no.
Slower deceleration will result in more time at high speed and so results in more heat, not less.
Stop being stupid. You are asking him to cough up tens of thousands of dollars when he is asking people to spend money that they were going to spend anyway in a consciously anti-fossil fuel way.
Just cos he's not charismatic doesn't make him wrong.