Once you suspend disbelief of AI all of this pseudoscience becomes just as plausible.

I'm actually interested whether there is some larger explanation on these study methods. Maybe there's something worth integrating with myself and get more efficient at learning.

I think everyone wants that but there really is no silver Bullet in explaining or understanding how to make this technology more effective or more accurate. The companies themselves can radically change the models, behavior intentionally and unintentionally. There is no guarantee that any insights that you gain today will be applicable in the future.