The idea holds merit.
How it is applied in this case leaves much to the imagination.
As mentioned in above replies, thermal de-polymerization takes relatively high temperatures, pressures, proper C-O balance and residence times. The device in question provides little if any of the needed parameters to produce hydrogen gas and carbon monoxide ( the mixture being traditionally called coal gas or in modern parlance, syn-gas).
The only item that may be of help is the copper tubing wrapped around the exhaust. Copper, as well as iron, nickel and other base metals can act as a catalyst in the breakdown of carbon chains dramatically reducing the temperatures needed.
Another may be the content of alcohol in the fuel itself. Methanol and Ethanol decompose much more readily than the rest of the fuel constituents. A significant percentage of ethanol (5-15%) as found in some USA markets could provide a useable production stream of syn-gas allowing effective augmentation of the combustion cycle.
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