How do you square that with them removing sensors from their cars and going all-in on doing self-driving exclusively using vision? If they were so passionate about spending money to make the safest cars, they'd be doing sensor fusion.
That's your opinion. They have shown data where the information from radar was of a lower quality than what their vision stack was providing (e.g. lack of vertical resolution). Watch their AI day webcast for examples. Their current vision-only stack has been validated with LIDAR ground-truth data.
So far their biggest problem is that they allow flicker. That's why sometimes the software picks the wrong lines. (Of course this is a very hard problem. Our brain conveniently smooths over sensory changes for us, because that's how our everyday reality is. Things don't flicker in and out of existence, nor does a car suddenly appear as a different thing, then switches back.)
And if it turns out the sensor(s) failed, it has to be able to handle that too.