Earlier quoted context omitted.
Agreed; this isn't at all ambiguous. If you were allowed to cross, it would be a walk signal with countdown.
That is a joke -- people walk at different speeds. Walking in carland is enough punishment. The worst are burbias where the walk signal never comes on if you don't press a button.
LA was the only place I've ever been crossing the road with the valid pedestrian signal and had to stop walking or I'd literally walk into the car turning across my path (to the right, with the same green light I'm crossing with). It happened a couple of times, and I was only there for one week.