Dude, you just picked a fight you are going to LOSE. Big time. Since you're obviously deaf, dumb, and can't tell that that audio file is dramatically altered, I'm gon' hit you in the face with the reality. I'm sure you're totally an expert on the music industry.
First, try this on for size:
There's no mic here. But you're probably right, they made her swallow the backing track and that's what's coming out of her mouth. And that's why she's kneeling; so she can mover the box around in her stomach. Oh, and she's singing for sick children in a hospital. So, what do we learn from this? Well, first of all, success isn't always given to talent-less hacks. Second of all, you're a D-BAG! Go find something worthwhile to do while Beyoncé sings to hospitalized children across the world. Or, maybe you'd like to go tell the girl in the community talent show that she has no future. Or kick a puppy, perhaps; it wouldn't surprise me. Pessimism like yours is worthless, sorry bud. Third, you mess with Lady Bey, you mess with me.
That felt good, I'm done. Nothing to see here, move along people.