All opinion. I disagree with it. Sheesh, dude, they obviously don't cover mathematics in law. The angle and movement speed of his arm did not deem it unnatural. Look at the whole movement of his body and his face. He thinks he's going to be hit, moves his chest, closes his eyes and his arm was moving slightly, but not aggressively. To be unnatural would require sight on the ball. Replay shows the ref over reacted. Seriously, if the opposition belt it at you and you happen to be in the road, how long do you have to react? Not much time, maybe a few tenths of a second. Add it all together it wasn't unnatural. The word unnatural indicates intent. It wasn't. It happened so fast one cannot say it was unnatural. The angle was not 75 degrees. It was closer to his body than further away. Lastly, he was moving before the ball was kicked, not after. Too hard to quantify as unnatural. Benefit of the doubt. I'll leave it at that. It's done...nothing will change that.
You'd be surprised at what offficials around the world will allow at times. They are far from steady, strong and consistent.
Back to the gameplay. Germany will rip Ghana apart. Lots of yellows. This will come back to bite them.