“What would it mean for your business if you could target potential clients who are actively discussing their need for your services in their day-to-day conversations? No, it's not a Black Mirror episode—it's Voice Data, and CMG has the capabilities to use it to your business advantage.”
Google’s business model is end-to-end targetted advertising. They collect raw data, process it, and serve ads for customers. They do not sell data because that undermines their business plan.
This company is making claims that they can do end to end advertising. That means they must get their voice data from some other source.