I'm sure either:
A) They did know. I'd bet you anything they typed in 'allstar cheer music' into youtube, found every mix that came up in top 10 (and we know that the popular worlds-contenders would be at the top of that search), and cut some of that music together. Forgive me if I'm wrong, but I don't imagine there are lots of cheer music mixers in Jamaica. Or they'd know a major mixer to contact. Or that they felt their money was best spent that way.. OR
B) They didn't know. They hired out somebody who did the above or had someone else do it (family member who's good with a computer/music editing).
Either way it was awkward and you could tell they didn't like the mix. But as soon as music came on that they felt connected to/comfortable with, they ROCKED OUT.