If it wasn't for the masses of fans, commenting about how "perfect" and pretty and horrible Cami may or may not be for possibly, maybe, dating Matt, she wouldn't have a story. Don't shoot the messenger, y'all. She's just writing based on an outsider's POV.
Furthermore, just because we may know that Cami is wearing SOT practicewear doesn't mean that she knows. That's an unrealistic expectation. Seriously.
We know the details because we've been around this for a long time. You can't really expect someone who's just ventured into our world to know gym colors or uni designs or coaches. I could use terms with cheer people - F5Jason, dorito, jank, Susie's Mom, Teal, The Queens, Apple - but non-cheer people would have no clue.
And I didn't view this particular article as a TMZ-type thing. Again, it was "Holy bejesus. These cheer people are freaking out about cheerlebs breaking up." I think she was trying to show the connection between actors/singers and those types of celebrities and cheerlebrities. I truly believe she's trying to get it, but based on the fact that the cheerlebs are minors, and are becoming quite popular with the real world, even though they're part of a relatively small community of people, it's new and kinda weird.