Interesting concept. However, as the video points out - the company is lying about at least 2 easily verifiable things. What else aren't they telling us as they try to raise money.
TL/DR on the video. The engine has some advantages mainly simplicity, size, and weight. The downside is likely very low torque at high RPM. The most likely applications are as a range extender, airplanes / drones, and generator. Basically applications were small and light is key and RPM is fixed.
I'll add another likely problem which is emissions unless it runs at a fixed RPM.
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