Gas(oline) engine has nothing to do with it. The AF mixture typically has some time to mix before reaching detonation conditions or being spark ignited. Looked back at some of their available info. They're injecting at TDC or essentially into a fully compressed vessel which wouldn't be without its challenges; achieving a somewhat homogeneous mixture being one of them. It would make for some interesting combustion dynamics at a minimum. Make me wonder if the associated combustion event takes a little longer to complete versus a CI engine that injects before TDC. Would be monster cool if someone with some specific insight would educate me here.
From a eyeball analysis, this would also seem to be detrimental for unburned hydrocarbon emissions. This is something two strokes already suck at. This will be a probably be a target for anti-aviation types (e.g. leaded fuel now) in the future if this PP gains market share.