It’s a Sterling engine. It uses the difference between the heat on the stove and the cool air to create a flow of thermal energy that literally drives the motor.

It doesn’t give the US control, it gives a specific cohort of misanthropic scumbags leverage to accomplish their misanthropic scumbag agenda.

There is no good reason to redact this information. Giving extra ammunition to the class of people that has been fighting to the nail to cover this all up is in no way a benefit.