I might be dumb but is the story just an example of what you can do or is it neccesary?

I agree, it really isn't clear what the theme is, what is required vs what is just flavour text.

Same here, the theme is only animatronics?

The story is to set the mood or just inspire ideas (from what I can tell). The theme is: "Make a horror game in 2 weeks themed around animatronic monsters and cursed, condemned establishments."

As CelestialStudio said, the short story is simply to set a mood. The theming for this jam is to make a game themed around animatronics and or cursed/condemned locations.