Haven't seen the video, but I'm sure there are folks that could break a bowling ball.
The sling swivel is really only used to secure the bipod's base to the stock. Once it's tightened down, all of the weight and pressure is distributed to the entire bipod and not just the sling swivel. My bench rifles weigh in the 10-11 lb range and the Caldwel bipods have held up well underneath them. Don't have a .30-06, but the .308 still transfers a good amount of energy to the bipod...