The argument is more complicated than Elon makes it out to be. "Humans can drive with vision alone => computers can drive with vision alone" implies computers can do anything the human brain can do. It's not a given, and it's certainly not true for the compute power in a Tesla. It's completely possible that all of the following are true:

* Humans can drive with vision alone

* A sufficiently advanced compute system can drive with cameras alone

* Telsa's FSD computer cannot match human performance without additional sensors