Changing to radar could be a running change, but if it is, it's very recent. I did look at the BMWUSA website, and agree, it does say radar based. FWIW, while probably not a big range buster, the camera is much more efficient than a radar, and, at least initially with the small battery, they sweated every gram and power drain to get the car as efficient as they could at a price people would still pay. That's one reason why it doesn't have power seats or a heated steering wheel...it uses power, and in the case of the seats, adds a lot of weight for the motors.
2011 535i x-drive GT, 2014 i3 BEV
Soon (hopefully!) A 2021 X5 45e will replace the above