Yes, but technically sophisticated entities can also use methods that require less effort.
The point is that while you can use DNA to identify people in most cases, sufficiently motivated adversaries have more effective, cheaper, lower-technology approaches that they will use first.
Me shouting my sensitive private details in a crowded bar is entirely different from putting them on my webpage. There's even a difference between writing them down on a napkin or shouting them out.
I guess it's representative of the demographics here. Nobody capable of conducting themselves honestly.