Isn't that exactly what this is addressing? This is splitting up AdSense such that any third-party buy-side operation that wants to use AdSense as the network

Isn't that exactly what this is addressing? This is splitting up AdSense such that any third-party buy-side operation that wants to use AdSense as the network is on equal footing with Google's own buy-side using AdSense. If anyone else can run that side of the equation better or for cheaper, they can now do so.