I know what you mean ska and ultimately unless someone actually knew the man it is all speculation.
I understood the piece - and particularly the ‘cogent, coherent’ bit to be an (albeit clumsy) way of refuting the notion of Perry (and other Black visionary artists like Sun Ra) having some kind of “natural genius”, a variant on the ‘noble savage’ trope, a mysterious & inexplicable talent beyond rationality & sanity that bypasses the usual need for musicians or other artists to study, practice & rehearse.
In fact, and as is attested by people who’ve observed him at work in the studio, Perry was a hard-working, disciplined perfectionist who could work 12-16 hours a day and would repeat take after take before he felt it was right.
I imagine many of his trademark production sound effects were achieved through hours of trial & error.
I don’t doubt he was genuinely mentally disturbed at the time of the destruction of the Black Ark; I just question whether that mental disturbance continued for 40 years, or whether he subsequently found it useful to mimic or exaggerate what had at one point been the symptoms of actual mental illness and distress.
In later interviews he seems mostly to be in a happy & playful mood whereas in 1980 I don’t doubt he was experiencing real trauma.
But having never met him, I admit this is merely guesswork on my part.