Then they got sued by the company that was targeted, and immediately waffled and canceled the ban.
What's insane about all of this is that we also have Rent Control. There is no greater price fixing mechanism than Rent Control. Rent Control ensures that all landlords must seek the highest possible rent, because they are (potentially) tethered to it for life (of the tenant).
So if you create an economic system where sellers never will allow prices to go down, why bother banning price fixing -- its practically baked into the housing code.