I can't believe they get paid for it. I really can't.
I used to work in marketing, and there's a shit-ton more that goes into marketing metrics than what they share out to the public. This is basically just an overview that tells you that on a cost-per-click/action ratio, Sony is gaining more bang for the buck.
At a fundamental level, all companies approach marketing with a limited amount of money, an estimation of the kind of campaigns they want, and an expected CPA out of this. Through that, selection of channels, air-times, calendar periods, etc, built on demographic understanding, studies, etc are laid out. From there, engagement plans, innovation, ad stickiness, a lot of different metrics are identified within qualitative products to gain that superior ratio.
You're right that ultimately, it's very difficult to practically impossible to find out whether or not that action translate to sales. However, without action, there can be no gauge of interest in the first place.
Marketing analysis is what it is.