Definitely not, lol.
Played properly, the flute should sound clear, high and light. It sounds like this girl is placing her embouchure incorrectly; if it's too far left or right, or if it's directed away from the mouthpiece instead of into it, then the air's isn't flowing into the flute properly. That's why it sounds muffled.
Or it could be that she's nervous and her breathing is shallow. That could be it too