I just skimmed the article and I don't know enough about frauds pretending to memorize, etc.
I can hardly memorize a Mozart piano sonata. So I find anybody that is good at memorization to be amazing.
I've known several illiterate people that memorize what would amount to an entire devotional book of prayers; also I've seen an illiterate person that was a living library of poetry (she's since past away, R.I.P.).