I also heard this from other teachers in Iwama (albeit without the Disney reference). While I think angling the body as a whole is sometimes necessary, there should be no kinks or "blockages".
So angled body as a whole is good, but bum sticking out is bad? When you say angled body, are you referring to the type of posture in Demetrio's video? If that posture is a good thing, what advantages does it offer? (this is a serious question, not a challenge)