I’m skeptical of my assumption but I think this person died not only from the illness schizophrenia but because of the religion that fueled his illness. I theorize psychiatry isn’t wanting to approach religion as bad for some people but there is the possibility of ideology provoking delusions for people with schizophrenia more so than normal people.
There's another (lengthy) video that I watched on Terry and TempleOS recently here [1] which was quite good. Honestly, it's such a tragic story. The guy was clearly talented but wasn't able to ever get the help needed in order to properly harness that talent.