[SPOILERS] Am I getting this right?

Everything that happened, happened. The end credits scene is probably Dolores in the future testing William for fidelity. The Emily that was doing the testing is a host. The real Emily died last episode when she was shot. Dolores/Hale stares at dead Emily on the beach right before getting on the boat, probably getting the idea to use a host version of her to test a new William copy in the future. Dolores now has all the guests data and can now make copies of them. Maybe she recreated all the hosts and encounters that MiB had these past 2 seasons to mimic what really happened during the uprising, thus turning into the ultimate fidelity test. But again, EVERYTHING THAT HAPPENED HAPPENED. I know a lot of people are saying everything was just a simulation, but well its kind of both. The events did occur, but in the future Dolores recreates MiB's journey to see if he would pass the fidelity test.