The article doesn't use a consistent definition of sensors. Notice how Mercedes' number is reported to include their emergency microphone as a sensor, but Tesla

The article doesn't use a consistent definition of sensors. Notice how Mercedes' number is reported to include their emergency microphone as a sensor, but Tesla's number only includes cameras + ultrasonics. Ultrasonics are counted, but not the IMUs that may also be involved in detecting collisions. If you were to truly count every sensor connected to every chip, there'd be hundreds or thousands of sensors. Only some of them are used. Different vehicles in a testing fleet will have slightly different numbers as well, due to the various component changes that are in-flight at any given time.