If your into old engine designs this ones been around in a different form for at least 50 plus years, but with , computer tech, the improved design is much improved over the original concept,
a very old idea that was significantly improved and upgraded with new tech & materials
if they build a version with significantly larger displacement it might be a huge potential advance in your gas/propane or other fuels, engine designs, a 4-5 ltr version, with maybe 10 cylinders should be very impressive