Efficiency claims that look way too good to be true usually are, and you have to ask how everyone else in the field somehow overlooked this apparently easy mone

Efficiency claims that look way too good to be true usually are, and you have to ask how everyone else in the field somehow overlooked this apparently easy money, especially if the underlying principles are well-known and have been in use for decades, as is the case here (blown flaps and such in combat aircraft.) I do not know whether this is the case here, but the trick to making such claims, without actually dissembling, is to first be highly specific about what it is that you are measuring and comparing, but then be quite vague about it in the press release, trusting that a journalist will cherry-pick from the claims to make his story look exciting, and quite possibly mix and match claims that cannot be satisfied together. If this technology really could give 10% more thrust with half the power and 70% of the weight of a turbofan, then Jetoptera (or some other company) could be making real money converting at least business and commuter jets to use these devices - so why isn't this happening? The whole 737 MAX debacle started with Boeing being under intense competitive pressure to improve fuel consumption by just a few percent. We also see that "Jetoptera is more or less agnostic about where it gets its compressed air from, although it reasons battery technology will need to reach energy density figures around 1,500 Wh/kg (current state-of-the-art batteries are around 260 Wh/kg) before it'll start making sense to fit the J-2000 with an electric compressor." That would be just a 477% improvement in a feld where 10% is a big deal! Note that current battery technology is already sufficient for conventional electric airplanes to begin to be useful. With regard to your last paragraph, none of these technologies are trivial even in isolation, let alone combined, regardless of the number of puff-pieces like this one written by people whose enthusiasm seems to exceed their understanding.