Well a lawyer would ask did he step in the box initially as a left handed batter or was he initially batting right handed and took a practice swing right handed out of the box and then switched over to bat lefty?
I stand by my statement that you can't switch handedness during a PA even if the pitcher changes during the AB or a new pitcher comes in.
He didn't switch handedness in the box. He was LH the whole time. His practice swings out of the box were RH. Never seen that before. That's all.