I've seen this vid before and read the comments on youtube. I didn't think it was real at first but an animation. Couple of reasons.
The orange sections on the tower have faded significantly but the white sections look freshly painted. No chipping, peeling, staining, etc.
The drone flies almost perfectly straight up the height of the tower with very little yaw or left / right drift. Remarkable image stabilization.
Overall, the colors look like a rendered animation and not real. More like Tom Hanks Polar Express motion capture than natural daylight and movement. But then again, it seems to be a legit company so I'm nit picking.
Our tower is 1000' so crews must climb it's full height. Once the first man is up, he rigs a bosun's chair and they use a winch and cable for others to ride up or down.
Not for me, I stay on the ground.
Tobit