Sorry but no. It wasn’t. In this example there was a particularly sadistic owner. That was not the norm. Scars on a slaves would indicate a slave who was either disobedient or who tried to run away. Both would lower the sales value of the slave.
The truth is slaves had been getting whipped for hundreds of years. Northerners didn’t care - just like they didn’t care that Yankee slave traders treated slaves far worse. It wasn’t a morality play no matter how much you want to pretend otherwise.