Everyone's definition of a spoiler is clearly very different. I mean, there's so little real story in this game compared to say, an RPG, so every story event matters. I'd classify something like the events in that first video as something I wouldn't want to see before playing, but to each his own.
You understand when you say, "this big event isn't a spoiler" that you're implying that the event gets reversed later, or that it doesn't have any lasting consequence because of some other event later. It's like showing someone Gandalf's fall in Fellowship and then saying, "don't worry, that's not a spoiler, he doesn't really die". :lol