It takes a helluva lot more than “pounding on the door” to split the door jamb. You’d have to hit it with a battering ram. This guy clearly overreacted.
You are misinformed. Most door jambs are made of 0.5in pine and attached to the 2x4s with 3/4 or 1 inch screws. The door can be kicked in with one strong kick next to the lock.