Just as a follow up: I emailed guest services and asked the question. Here is the response
Guests with dining times right at or prior to Park opening are required to provide the confirmation number to a Cast Member at the Park Entrance. You will then be directed to the restaurant location. You should allow 15 minutes' walk time from the Main Entrance to the dining location.
If you have any other questions or challenges, please do not hesitate to contact us by replying to this email or by calling us at
407-939-7765 and we will be more than happy to assist you further.
Sincerely,
Dayton Brown
eCommerce Sales and Service Team