It's my understanding--and I could be wrong about this, because NA languages are not something I know a whole lot about--that quite a few Native American languages work by adding suffixes or prefixes, where we would add verbs or prepositions or whatnot, so that you get potentially very long words that in English we would have divided up to a word with a number of modifying words. So that might be what those extra syllables are. Just a guess, I haven't actually watched the video.