The perks are based on the hotel you are staying in, not how you booked it. I have booked even Disney owned resorts via third party and always had all the perks. The S&D specifically mentions the early entry and 7 day LL window on their website, so you would be entitled to both.
The only thing you typically don’t get are loyalty points if booking via third party vs booking direct (if you are a member of Marriott’s program).
To add on to PP besides no loyalty points, 3rd party Marriott bookings generally don’t give any status benefits (some hotels still give them but they aren’t required to).
Double check your price against booking direct with Marriott. Swolphin has a variety of discounts- AAA, teachers, first responders, APs, Seniors. Make sure the resort fee is included in your comparisons, if you have a car don’t forget parking is extra.
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