It sounds like they took a few too many shrooms. The key is to take the smallest amount possible and only once. They will continue to "work" as the brain is thrown into a state of rewiring itself perpetually if only because of prior rewiring. Basically an avalanche effect.
But when people see a benefit they decide they want to do it again not realizing that the effect is going to stack and they get schizo and lose grasp of reality.
Basically because of the avalanche neuro-plasticity effect, the true pharmokenetics of a psychedelic is about a year.
Applying some analogy to artificial neural networks. Yes a neural network can be locked out of progression by finding local minima and introducing some plasticity can be a benefit for it to get an even better fit to reality. But if your learning rate is too fast its fit to reality is worse. Any small amount of plasticity is enough plasticity. Beyond that you are just breaking your brain for recreation and making an excuse that it's good for you.
The dude is talking about seeing mantises in real life sucking on people's brain. That's not a psychedelic insight. That's called induced schizophrenia.
Yes schizophrenics can say things that are real and sometimes a little too real for the average person to hear. But they also say a lot that is bullshit. There are other kinds of people who aren't pinned down by correctness that also have a more reliable grasp on reality.