The earlier attempts at The Legends of Pocket Billiards event did not have the triangle marked, I believe. By the time of Jayson's record run, the triangle was marked with a black outline.
In Jayson's case, the marking was irrelevant since there was no break ball within a ball diameter of the rack during the run. Jayson moved the break ball into position on about half of the racks. In some racks he moved the ball two or three times. He did not accept break balls that were close to the rack that most players would have gone with.
There was only one back-of-the-rack break shot and no side pocket break shots in the run. I don't think I've ever seen anyone else with that kind of control.