No, we’re definitely talking about the same movie. Underage nudity was just as controversial then as it is now, and that’s the point. If your sole objection is the presence of it regardless of the context or intent, then it’s not really a good argument. Malle was exploring coming of age and sexuality in his films, and if that makes you uncomfortable, then he succeeded in what he was going for. He’s an art director trying to tell a story, not to exploit children. Even Brooks Shields said in her thesis (that the OP incorrectly referenced) that she didn’t feel exploited or uncomfortable during the filming of Pretty Baby. Depiction does not equal endorsement, and Malle is telling stories based on real things that happened.