When he said there's no djinn, I was about to say he's technically not lying because she's a human magician who called herself a genie(to the kid).
Huh. I thought we got a naive ml because he followed his brother's orders who is his political enemy. I guess he's still a prince, so he should be aware of his standing
It's also nice that he took Amina's wishes to consideration. If he revealed it, no doubt she'll become a political treasure that will be summoned again and again. Not only will it disturb her much desired sleep, she'll surely end up shouldering unwarranted responsibility or threat or be subjected to research.