The Skyliner entrance/exit is between the Epcot dock for the Friendship Boats and Beach Club. When you exit, you can either proceed to the Epcot gates or proceed to BC/YC, Boardwalk, Swan/Dolphin, or the Friendship Boats. But you can't enter the resorts without an ADR right now.
The current verbiage from Disney says that you must have a resort reservation at that hotel OR an ADR for a TS meal. I can't confirm how they're working the Boardwalk entertainment district now, but based on some reports and the wording from Disney, you would not be able to enter the resorts. You should be able to bus from DS to Beach Club, but would not be able to enter Beach Club without an ADR or a resort reservation at Beach Club.
All of that said, there was no enforcement of that while the resorts were open but the parks were closed. Since the parks have opened, some reports say they are enforcing it now by validating through Magic Band scans. How strict they will continue to enforce it and what it will be like in December is anyone's guess.