If that's not turning the idea on its head, what would be?I actually liked that one becuase it turned the aliens think humans are warlike savages thing on its head.
No it didn't. It just said we weren't warlike and savage enough, which is not the same thing as turning the notion on it's head.
The aliens not thinking us warlike and savage at all and thus not adhering to the usual trope. Thinking we're not warlike and savage enough just amplifies the old prejudice, as if our striving for peace means we don't know our place in life.