Black boxes doesn't mean it's not HD, silly.

1080p is 1920x1080 (so is 1080i but there's other differences there) and the aspect ratio has to be 16:9 or 16:10, meaning widescreen, meaning no black bars. Same with 720p, but that's usually 1280x720 or 1080x720. This video is not HD, it's SD. Just because you can render in 1080 doesn't mean it is 1080. It's like trying to turn a Volvo into a Ferrari.