My answer that is a hyperbole is not weak, because Itachi is not invincible.Sorry for the essentially part, I got confused but still, your answer that it's just an hyperbole is pretty weak.
Look all I am saying is that with a good timing and surprise Itachi can pull it off. Amaterasu can counter the wood techs you mentionned and wood dragon can only absorb bijuu chakra until stated otherwise, you just can't go assuming things no matter how obvious u think they are. Edo Madara is the stronger one no doubt but Totsuka + yata can be itachi's trump cards
Amaterasu isn't burning through the whole Flower World before it puts Itachi to sleep.
Lol, where was it stated that it only absorbs Bijuu chakra? Nowhere. Mokuton has been shown to affect ALL chakra so the Wood Dragon can absorb ALL chakra as the Dragon is the same as all Mokuton except for the fact that it absorbs instead of suppressing chakra.
Or he can make 25 Susanoo clones top beat Itachi no diff, either way will work and it always be no-low diff.
Totsuka and Yata are useless against Madara. I already stated how he wins if you wanna deny it go ahead...doesn't change anything.