That doesn't clarify anything. It's just restating what I just stated.

During genjutsu, of course the brain perceives it to be happening, hence the usage of the word illusion.

So the question is if mange produces pain by erroneously deceiving the brain, then why can't you snap out of it because of the pain? Just like how Shika broke his finger to produce enough pain to snap out of it.

Do you see how it contradicts itself?