It was the first fully drive-by-wire production car, and it was the first car with steerable rear wheels. That's an innovation, on one of the worst vehicle of all time.
This isn't really true either, there have been a few production steer by wire cars before and quite a lot more with steerable rear wheels - there were Porsches with rear steerable wheels in the 1980s.
Rear wheel steering has been pioneered long before the Cybertruck. Tesla hyped the feature, sure, and it worked really well with steer-by-wire. But they were far from the first.
I am pretty sure that I have seen cars with steerable rear wheels already a half of century ago, when I was a child.
However, I do not know if any of those was series-produced.
They may have been only demonstration prototypes.
> it was the first car with steerable rear wheels
Not even close - there are probably at least a dozen 4 wheel steering cars going back to the mid 80's starting with things like Nissan Skyline, Honda Prelude, etc.