Cahlen, I hate to be a Debbie Downer, but please know that Don Juan was a narrative fiction created by Casteneda. He did not actually exist. Fifteen years ago I did a lot of work with Jan Irvin and Richard Grove on this. Here is a summary of what we found. https://logosmedia.com/SecretHistoryMagicMushroomsProject
Your linked article has no references to Castaneda or Don Juan...
I'm sorry. That was the background article which describes the core of the Deep State psychological warfare operation that Mckenna was part of. Evil always takes what is Good, and perverts it via Inversion. This is the case with esoteric spirituality and psychedelics. I just wanted you to know about this ancient, 5,000 year-old war, and that you should proceed with caution. Here are the articles specific to Mckenna... https://logosmedia.com/2013/05/manufacturing-the-deadhead-a-product-of-social-engineering-by-joe-atwill-and-jan-irvin/ https://logosmedia.com/McKenna-Agent