Too early to say if it pseudoscience. They don't know the effects yet. It is just risky tinkering.
https://en.wikipedia.org/wiki/Pseudoscience
Science is not "if it works. It's science." You can be correct by change or by having right intuition. Science is systematic way to organize and build knowledge.
That's what makes it 'pseudo'.
That is not a useful definition.
Sounds like scientific fact to me. We know it works, it's just a matter of establishing effects on specific tasks.
When scientists study these effects, they study them over groups of people. For some individuals, it hurts where it should help. For others, they get a larger-than-average boost. At the same time, research seems to suggest that some abilities are increased while others decrease, for a given protocol.
It's not pseudoscience that a lot of people are trying a new, untested thing. It's pseudoscience if they claim benefits based on subjective perception or claim that the same protocol will help everyone, without documenting objective, replicable proof.
They have an apparatus, but nothing else of the scientific method.
The results of a trial are judged in some purely subjective terms.