The whole guide could be retitled as: how to cultivate your own psychosis. The technology is sound but does not lead to wellbeing.
I think Buddhists figured it out (at least some of them). For example metta practice could be thought of as a magick that is specifically aimed toward wholesome happiness.
Once I could personally meet or just see people (in person or otherwise) that attempted this kind of rewiring of your synapses I realized how deeply unwell they really are.
And for the untrained eye, your point takes it away: Have a hard look at folks who tried (like Crowley, probably the most documented case) and be wary of following advice on the web that puts your mental health at risk, even on HN.
One thing that makes me wonder: how does intentionally created psychosis compare to involuntary one? Can science study those things to have better understanding of mental health and actually help people?
I think Buddhists figured it out (at least some of them). For example metta practice could be thought of as a magick that is specifically aimed toward wholesome happiness.