doesnt that contradict itself ?
Not necessarily.
If it's possible to construct (and I believe it is) a single example in the course of play for an outfield player to, say, have their arm outstretched inside the penalty area - an "unnatural" position for an arm - and have it make incidental (non-deliberate) contact with a ball, then we have to admit that "natural" vs "unnatural" positioning of an arm cannot be used to determine whether or not it's a penalty.
That is the way the rule stands now. Intent only - was it ball to hand or hand to ball.