I'll admit haven't actually read the book, but from what I've heard, the character Don Quixote is someone obsessed with chivalry, who thinks he's a knight performing heroic deeds for his lady.
I understand why the idea of someone acting out his fantasies might symbolize ILE. But as far as the character himself, doesn't the picture overall seem more NF-ish, possibly IEE? It seems that Fi rather Ti seems most relevant to his moral quest...his view of himself as rescuing others, etc.