someone in a few recent posts said "side arm is irrelevant does not exist" how ever if your wrist is out side your elbow, it's an illegal pitch, game over. call em or forget em
Just because 'sidearm' is not defined as a term in the rule book doesn't mean it is not labeled that for ease of description (just as 'change up' is not defined in the rule book either but we all know one when we see one).
That said, what was stated is that that the rules says "the hand shall be below the hip and the wrist not farther from the body than the elbow."
The "below the hip" is extremely relevant in this case. You can argue that part of the wrist is inside the elbow in your images if you draw a line straight down from the inside of the bend to the wrist - or more to the point it is extremely hard to determine one way or another.
What you can say in your images is that the release is below the hip and satisfies that part of the rule. With a windmill action there is no way I can see to release the ball at hip level without a major bend in the elbow away from the body. At least no way I tried that would physically work.