An entire engine? That sounds like a marketing plot. But if you take smaller chunks let's say the shape of a combustion chamber or the shape of a intake or exhaust manifold. It's going to take white noise and just start pattern matching and monkeys on typewriter style start churning out horrible pieces through a simulator until it finds something that tests out as a viable component. It has a pretty good chance of turning out individual pieces that are either cheaper or more efficient than what we've dreamed up.

and then simulating all the toolpaths to be able to export the G code for a CNC machine. I don’t know how much of what I saw is smoke and mirrors, but even if that is a stretch goal it is quite significant.