Yup those were Dogos not pits. They use the hound dogs to find the Boar, then unleash the Dogos. In Argentina where these dogs come from, the Dogos hold the Boar down while the hunter slits the pigs throat with a knife.
And no, a pitbull is not your first choice for a hunting dog. Pits are a jack of all dog trades , but a master of none. They have a lot of whippet mixed in, so if anything they make good sight hounds, not what you're looking for in a boar hunt.