No, radar cannot see the Cybertruck. And in fact, except for the prototype for demonstration, humans will not be able to see the Cybertruck either, totally stealth. That's why what the truck looks like is irrelevant. Your phone app will, however, be able to locate the truck in parking lots and such. It will also have a protective forcefield to deflect other vehicles, pedestrians, and the like. It's still controversial what to do with smart summons, pedestrian warnings or whatnot.......