This happens to be correct for those Yimas and Wichita examples I gave, but in many languages the relationship between the constituent parts and the word itself is extremely nontrivial, e.g. in Mohawk:

tcioteriʻsioñʻhắtie né hotăskoñnioñniʻhătiḗne

s-yo-ate-rihsy-u-hatye-∅ ne hro-at-askw-uny-∅-hatye-hne

And in any case, most of the ‘individual words inside the big word’ aren’t ‘words’ at all but bound morphemes, in many cases with quite general semantics which are more along the lines of ‘someone caused this’ or ‘action done multiple times’ rather than anything more concrete.