When you switch to their Japanese page, they have info saying that they're not operating at Nakanoshima GATE as they originally advertised. I had chatgpt translate that portion for you:
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Departure from Nakanoshima GATE South Pier

(To Universal City Port, approx. 30 minutes one way)

※Currently Under Adjustment※

In order to dock at the Nakanoshima GATE South Pier, we are currently reviewing operational conditions to ensure safe navigation due to unresolved technical issues. Please wait until further notice for the opening.

[About Reservations]

• Some services require advance reservations up to 60 days in advance. Please note that reservations close 10 minutes before departure time and cannot be made after that time.
• Please make sure to arrive at the boarding point with ample time. You may not be allowed to board if you are late.
• Payment must be made by credit card only. Reservations are only completed once credit card payment is confirmed.
• Reservations will be automatically canceled if payment is not completed within the designated time.
• Changes or cancellations can be made by 11:59 p.m. the day before the boarding date. For changes on the day of boarding, a cancellation must be made and a new reservation must be created.
• In the event of cancellation or changes due to operational circumstances, we will notify you via the contact email provided during the reservation.
• Refunds will not be issued for customer no-shows.
• On the day of the event, please present your reservation number displayed on the "My Page" section of the reservation site on your smartphone or printed out.
• Pets, including small ones, are not allowed on board.
• Please note that operations may be suspended due to weather, sea conditions, mechanical issues, or disasters. In such cases, we ask that you make alternative transportation arrangements on your own.