It sounds like, from what you posted and what
@auntlynne posted just above, that maybe you can use it to embark/disembark on the cruise overall, but you will need your KTTW still at ports. It's a little confusing how
DCL has it worded (especially in the two different spots), but that's how I interpret it (that you can use it for boarding the ship the first day, but then need KTTW for ports of call).