Your driver was brainwashed by propaganda. No response necessary.
It seems true that if Prop 22 were passed, he would have to become an employee for one company, so he wouldn't be able to work for 5+ companies at the same time.
There are many alternative ways to structure this relationship. Many with just as much or more chance of being long term sustainable for all parties than the current model which definitely works for one party but we have good evidence is not sustainable and workable for all the workers some of whom are being chewed through and exploited.