TD, true. For a long, long time American spelling and pronunciation were the scourge of the wider English-speaking world - and only latterly have these gained widespread acceptance. And some words are so rarely used, let alone spoken, that it likely doesn't matter that they are mispronounced.
BTW, I am yet to be convinced that a word such as "hyperbole" even appeared in the Watchtower. I had thought the writing in that leaflet was confined to elementary-level reading.