It also says it requires valid admission and if you’re going on any day that isn’t good to go (most of them aren’t GTG so those are really an exception to the rule) as an AP holder you do not have valid admission for the whole day without a park reservation.
“
Valid Admission Required
Before you purchase a
Lightning Lane pass, you must have valid theme park admission; you may also need a theme park reservation, depending on the type of admission and the date of your visit.”
Great of Disney to make this so clear