This appears to use the same principles as the Scuderi "air-hybrid" engine, that has one cylinder compress the air, and then inject the compressed air into the combustion cylinder at the same time as fuel is injected.
However, the Scuderi engine also gets some benefit from the fact that the compressed air loses heat when it expands, which results in lower combustion temperatures, which results in lower NoX emissions as well.
2 stroke ?