Anybody that's ever spoken to a salesperson knows that they're talking out of their arse most of the time, and I doubt this is an exception.

He's said this because he thinks that the people he's talking to will give him more money if he does.

If it was happening at all you'd have seen proof by now. Like people pulling apps apart and finding proof, not just "I spoke to Bob last week about cameras and now I'm seeing ads for cameras".

The truly terrifying part is they don't need to listen to your conversations to know what you want.