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The air hogs engine is exactly the same.
CO2 engines have been around for quite a while. People build very small ones to put into model planes.
Basically they are a 2-stroke engine with the porting optimized for the application. I believe the French man. is using a "multi stage" engine. Air runs through the first set of cylinders, then the "exhaust" is run into another set of cylinders designed to operate on the reduced pressure... I don't know how many stages it has, but it helps extract as much energy as possible.
You can run your weed eater by putting a compressed air into the spark plug hole 7 pulling the starting cord to get it to go the right direction. I would try it without the carb on it though.
Don
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