I had no idea floccinaucihipilification was a real word. I saw it in a fake spelling bee for a commercial decades ago and assumed it was just a comically long fake word.
It's a Latin calque. I'm sure the spelling should be floccipaucinihil... from pauci, few and nihil, nothing - you and the reviewer have used spellings that differ from this and from each other, but I doubt O'Brian did.