This is correct.
Regarding the required age, in March, the age requirement was 18, not 16. We stayed in a Haven category and purchased passes for our extended family. They said the age rules are the same as the Vibe and not the Haven sundeck. On all deck plans, it is called Posh and not the Haven sundeck. However, your 17 year old will have no issue walking in with you., I just do not think her cabin card will unlock the door.
This was OUR experience.