The idea that Google’s lack of knowledge of you a decade ago is somehow related to what they know today is naive. Dangerously naive, I would say. Ad targeting technology (= knowledge about you) is shocking good now.
That platter of details is not shown to you, the consumer.
What you are experiencing is that your ad profile isn't valuable to most bidders, ie you don't buy stuff as much as other people do, or your ad profile is somehow super attractive to stupid companies that suck at running ads who are overpaying for bad matches.
It is not evidence that google knows nothing about you.
Google is pleased that you think they don't know you. It helps keep the pressure down when people mistake this system for "Perfectly target ads". The system is designed to make google money regardless of how good or bad their profile of you is.