this video was on CNN - it's actually pulled right from the DVD they released for the day. You can look at all the other networks' clips as well - they all show the same thing.
Boeing admitted there was something on the plane, but they told people to contact the 911 commission and let them answer it.
People can be manipulated to say anything you want them to say. Physical evidence doesn't lie. Hell, you used to be a NYPD detective, right? WOuld you rather have the killer's DNA all over a victim, or a little old lady who saw 'something' out her window?
The video doesn't prove anything, of course. It's part of a big pile of small things that make 2/3 of America and 1/2 the 911 commision to say "hey, we need another investigation".
And um, you said "Why isn't it on TV"? How the hell should I know. They choose not to cover the story, just like they choose not to cover a lot of stories. It's their business, their channel, and they can cover anything they'd like.