The parent's argument assumes though that this kind of accuracy is achieved regularly and consistently today, which is way different than the report of one study.
It doesn't need to be consistent in order to be horrifying.
The fear is that big data tech will become radioactive.
Imagine a bus full of school kids crashes because the driver was a recovering alcoholic who fell off the wagon.
Some smart SV engineer realizes their tech spotted the driver visited AA groups regularly & his wife just left him. The algorithm knows this data makes him an excellent target audience for _new alco-energy drink!_.
It doesn't really matter if the technology is even capable of that yet, what matters is that this is the sort of outcome that adtech engineers are trying to create.