“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.”
You’re saying “no”, a 3rd party app couldn’t do it.
But it sounds like you are saying that Google itself, a company who likely to wants to do it, and is in the business of creating a comprehensive advertising profile of you, and who has shown multiple times that they will go to extreme lengths to gather this data from you… could do it. That is not super-comforting to me.
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.