Google <stores> most of your data. If you have your tax records on gdrive, google so far cannot target ads based on that content (i can't say forsure if you attach your tax form in gmail nowadays)
With SOLID any site can simply say "we need your tax records to prove you're a human or combat fraud whatever".
SOLID and all other not-solutions like it make your consent as useless as android app permissions. Accept a huge list they don't even bother to show anymore or go away.
Remember how android 2.3 you still could deny internet access permission? With SOLID it will be the same. Full ID data will eventually move to expandable list of permissions you will give by default.
I bet benners thought very hard about all the math and network etc. But he's being a buffoon when it comes to understanding applicability.