How does this differ from the idea that if I want to get a fence built and I call up three fencing contractors and tell them "I am paying $1000 for a fence", I'm effectively setting prices.
It's not as it uber is the only employer - most drivers I've seen use lyft as well and choose between them at will.
I didn't read the ruling, and I'm not sure if any one of those points is a "killer" vs the others, but I have seen that autonomy is a big check to determine contractor vs employee (touched on by 2, 5, and 6). Loosely speaking, when using a contractor, you're really only supposed to specify the end result/requirements that you want, and then it's up to the contractor to figure out how to get there, be it a new room expansion, or a website. With the constraints of 2, 5, and 6, it seems the court feels that drivers don't have that much autonomy.
As a rider, I cannot tell Uber I want to pay $20 to get me to the airport, I can accept their prices or not use the service. Uber is setting the prices for their drivers.
It's not as it uber is the only employer - most drivers I've seen use lyft as well and choose between them at will.