I know nothing about the actually physics, but all those polygonal, angled surfaces remind me of the chapter in Ben Rich’s skunkworks book about how a lot of the radar-defeating properties of the F-117 was due to the similar-looking geometry of the plane. I wonder if cops will discover it’s weirdly hard to speed check these :P
The stealthiness of the F-117 wasn't just because of its low-poly look. It was that the facets were oriented just right to defect radio wave away from the radar. In fact, the reason for the facets is that computers at the time weren't able to do design such a plan with smooth lines, it is not the case anymore, and that's the reason why stealth planes don't look like that anymore, starting with the B-2.
The Cybertruck is not designed for stealth and its weird shape may as well increase or decrease detection, but my guess is that it will be detected just fine by police radars, like the big hunk of metal it is.
