There is more to it, but I don't know the answer
My G10 camcorder has a "CMOS" sensor but has manually selectable shutter-priority shutter speeds, from something like 1/1000, through 1/120 (the fastest which eliminates prop effects), down to some very low figures. Yet it certainly doesn't have a mechanical shutter; it is totally electronic.
The bullet cameras suffer the ghastly prop effects because their shutter speed is extremely high - of the order of 1/5000 in bright light.