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Updating a previous story, I've located some more information on Myxx, thanks to commenter myxx fan.

Myxx has an official website. As you can see, no mention of Bad Boy. Ashley Phillips has an official site, as well. Again, no mention of Bad Boy. Both acts, as well as B5, are managed by Jamm Entertainment.

According to this fan site, the girls from Myxx and the guys from B5 are cousins. So, relation, same management, etc... that got them to Diddy's listening party and someone at the site mentioned in my earlier article could have assumed/mislabeled the photos on the site. I don't know with absolutely certainty, either way, but if they were on Bad Boy, they'd be trumpeting it, most likely and they're not, so there you go.