Design related question about video.

It would definitely be considered asymmetrical, but not necessarily unbalanced. Flipping it upside down isn't so much a specific test but rather a way of tricking your brain into focusing less on the smaller details, like text, and seeing the bigger picture instead, as alternating blocks of content and space. Shifting your perspective like this can give you a better sense of the overall composition, and if it feels just as balanced to you upside down as it does upright, then you're on the right track. But if it feels like it's leaning to one side too much, or the values are weighted too heavily on one side, then fixing them will make your upright design that much better. Sometimes you just can't see these things when you've been working on it for a while. But when a visitor comes to your site for the first time, they may notice these problems because the entire design is new to them. Turning it around is a way to approach your design as if it's also new to you, allowing you to experience it more like a new visitor to your site would.