Moving stolen electronics for phone components has been a consistent revenue stream for a long time and there's a lot of organization that goes into it. No one is pretending this solves the problem, rather that it creates a negative incentive for targeting phones specifically.
The world of scamming and petty theft is vast. I've known some real slick thieves, and they are of the opinion that lifting a phone is just not worth it these days. However, this deterrent is obviously going to be effective on a spectrum. If someone is trying to sell you stolen goods, are you going to buy a new iphone from them on the off chance you can get parts out of it?