The time to wait really depends on the region. where I live in Texas, a green PT deck installed in June can be stained easily by Aug. That is a constant over 100 degree days and sun's rays. But in other milder climates maybe what he/she said. Really depends.
Nothing worse than painting or staining PT wood, because, when the moisture evaps out the paint or topical coatings will go with it or blister up. Nothing worse of a use of your $$ and time than painting green PT wood.
Now, if you are going to wrap it, what ever that means, then go ahead with that. I do not see a problem with that even if green. You are not putting any coatings directly on the wood.
PT wood when dry needs a good quality of primer from a paint dealer and equally of finish paint. PT wood really is not user friendly with paint, but it will work. I would apply more coats than you would with reg wood.