2 points
This is all you failing to understand something very simple.
It’s the official trailer for the mod, that’s all it means.
6 points
No, I understood it fine as soon as I found out it was a fan-made mod.
I never heard of this project before and had no idea it was a mod when I clicked on the video that says both ‘Portal’ and ‘official’ in the title and on the thumbnail.
If you need context first then it’s misleading. The context of “fan mod” is not explicit from an outside perspective.