Figured those guys had a layer of braced plywood under it. But that ladder should be vertical.
https://www.homedepot.com/p/Werner-Quick-Click-4-in-x-8-in-x-20-5-8-in-Ladder-Leg-Leveler-PK70-1/100658844
I once encountered a younger guy hanging from street wires over asphalt twenty feet up with no bucket truck underneath.
Also seen videos of death from about the same heights.