I don't see an accusation of a mistake there. Perhaps it would be better said with a little punctuation:
"There are some things even God cant do, not because he has no power, but because he respects our choices."
Though I'd personally think replacing the "can't" with "won't" would be better, there is a point to be made there:
God gave us free-will, to override that will or even limit it, is to make it no longer free. (That is, the idea of a "limited free-will" is self-contradictory.)
God gave us free-will, to override that will or even limit it, is to make it no longer free. (That is, the idea of a "limited free-will" is self-contradictory.)
With all due respect, the point of my post is that the misperception that free-will exists is the error at bottom. If you disagree, please give us the passage where it is taught that man's choosing is free from God's influence. I believe it is possible to provide upwards of 50 passages wherein man's choice is directed by God.