Is the goal of the "dopamine fracking" metaphor is to represent a "pure concentrated dopamine hit", I would argue it is a more apt representation of what hard stimulants do to your brain (i.e. a shortcut to massive amount of dopamine release).
The perverse effect of social media addiction is more akin to a slow I.V. drip where you are always in a slightly aroused state, which then becomes your baseline and any cut from it is a net negative in your life.
I read the author as saying that his mind is being fracked, with all the implicit destruction that operation can cause, so that others can extract something from him. Yeah, I see that the analogy breaks down, because the extractors are after attention not dopamine (we're the ones who get the dopamine).