What is this even supposed to mean?

It is considerably easier to manipulate someone if you have a lot of data about them, yes.

No I didn't even imply that actually.

Right. As the source link explains at the end, one critical difference is that megacorp controlled journalism is the same for everyone, so it can't create scenarios where multiple diametrically opposed groups all simultaneously believe their views are very popular. That's much more destabilizing, because it creates issues where the status quo is unable to move at all because nobody's willing to engage in persuasion.

We should march head-first into a new exciting bad thing without question because the other bad thing was bad.

Incredible argument