A completely off-topic anecdote, then a completely unfounded fear based on a clear misunderstanding of this research. If companies ever start making us live in a MRI machine so they can reliably activate brain areas with certain stimuli, I think there is a bigger problem we are having.

Here is how I see it. This type of research helps us understand the brain, helps us do things like model potential surgery sites better (e.g. for seizure activity interventions). What it does not do is become the basis for mind reading.

Just so that you know that I am not totally unsympathetic to your apparent worldview, let me tell you how I think your concern might actually play out:

AI continues to get more powerful, and computer brain interfaces begin to move beyond EEG scalp electrodes, but begins to take the form or brain augmentation via integrating networked AI compute into implanted chips with electrode neural interfaces, where our brain's neurons and the neural interfaces learn to speak each other's language (i.e. integrate). I can actually see this happening within 20 years. At first, it would be our brain using this augmentation for greater intelligence, etc. However, remote manipulation of the interface could reverse control of brain activity, leading exactly to your fear.

But this research? This is light years from that,,,so much so that it is not even relevant to bring up unless you are just against all technology.