Rinoa is in the video, briefly, before the batteries die. She's shown reacting to Squall, doing her little finger nonsense.

If Squall WAS dead, Rinoa wouldnt be interacting with him at all, and the rest of the party wouldnt be jumping around squealing all happy-ending like. Squall isnt dead. He's off on his own with Rinoa, which is very Squall-like if you ask me. He isnt the sort to be mingling at a party.