Lewis didn't get anything wrong. He was on his gear box and went for an over take. KR forced him off the track. He then gave the place, was clearly of the throttle past the finish line, then over took fair and square. No one was in the wrong apart from the FIA. The mclaren was so much faster than ferrari at that point, he could have easily over taken on the straight and been several car lengths in front. Instead he stayed behind and took him at the corner.
what he did wrong was using a cut track to line himself up to pass kimi into turn 1 its quite obvious to anyone
you are right he would have taken kimi fairly later that lap so did not need to make a cut of the track to do it which is the whole point
if lewis had lifted in the corner he would no longer have been on kimis gearbox at all thats why the cut track has been punished