It was a penalty.
Same as a couple of others. They couldnt handle him and resorted to pulling and holding him. The ref allowed it to carry on. This was the most obvious one.
He wasnt just standing still he was looking to move and jump. He had no need to just throw himself to the floor as he would have murdered them without the fouls.
Could he have stood up.? Probably but as he was being fouled and had no chance of winning the ball because of the foul and he had got nothing previously he went to ground highlighting the foul.