Fluid flow is complicated, true - but the basic physical phenomenon of lift is very simple and completely understood: wings redirect air downwards, and the reaction force is what we call lift.
Is the development of new programming languages evidence that we don't "understand" computers? In some very abstract sense, yes, but in a more practical sense - no.
Saying we can't decide how wings work is not at all in the same category as saying these guys don't know how Q works.
One "not knowing" is about not knowing exactly precisely how to model something perfectly because it has so much complexity.
The other not "not knowing" is about not having even a basic working theory that doesn't use mumbo jumbo and stands up to scrutiny.