Right. Sims3packers don't actually include all content, and people on the BBS are tards, so you can't believe anything they say. THE CAKE IS A LIE.
Right as usual oh omniscient one. I think I've figured it out though. I believe that the outside sourced CC is in the file and does download, but it's in the wrong format. Since it's all packed together as a .sims3package, and the CC needs to be a .package, it doesn't show up in the game since it's under the wrong file name, explaining why it can't be found in-game. I told a guy at tech support that, he's forwarding it over to the development team.