I believe there might be a bit of confusion here. Orange roughy is actually a deep-sea fish that is not targeted by recreational anglers due to its habitat in very deep ocean waters, often at depths of 180 to 1,800 meters (590 to 5,900 feet). It's typically caught by commercial fishing operations.
For bass fishing, which is my area of expertise, the best locations to fish can vary depending on the time of year and the behavior of the bass. As Todd Faircloth mentioned in the Wired2Fish video, after the spawn, a significant portion of bass move towards the main lake where conditions are more stable, water temperatures are cooler, and there is a plentiful forage base. He suggests looking for "intersections" in the lake, similar to busy highway intersections, where multiple travel routes for fish converge.
In the context of the videos you've mentioned, anglers are looking for offshore structures like creek channels, drop-offs, and points where bass are likely to congregate. These can be identified using electronic maps and sonar to find contour lines and changes in depth that indicate potential hotspots.
If you're interested in bass fishing and looking for productive areas to target, consider these tips from the videos:
If you're specifically interested in fishing for orange roughy, I would recommend researching commercial fishing operations and regulations, as this is not a species typically targeted by sport fishing.