This is really cool, but estimating 280HP at 2L when naturally aspirated has already been beaten. The party trick here is definitely the pneumatic valve control being able to switch combustion cycles on the fly. If you just want max power per liter, Nissan's 3 cyl from 2014 claims 400HP at 1.5L [0]. I'm guessing this high-output small engine tech will never come down to the consumer level since they all rev at 7-8k rpm. If there was a way to build a 3cyl SUV, I'm sure someone would have done it by now.

[0] https://www.autoblog.com/2014/01/28/nissan-three-cylinder-ra...