Hmmm... thinking on it, I disagree.
My reasoning for this: from the background chatter in the episode, it seems the Cinderella Project had been on hold for awhile. To prove they have the talent and drive... as well as prove the Producer is as incredible scout for talent as he's supposed to be portrayed... Rin, Mio, and Uzuki need to hit the ground running. The fact that the trio were able to successfully pull off their PR shots, though it took a second try because of their nervousness, shows they've got the goods. The other 11 idols are insinuated to have done better... but they're also insinuated to have been with the company longer (and it might have not been their first PR shoot).
Basically they've been given a huge challenge... if they pass it, it will go a long way in furthering their futures... if they fail, it would be an excellent test of how they improve to never repeat the mistake or can handle the stress of failure.
Lots of high risk jobs do this kind of "in the crucible" type training -- the military, hospitals, and air traffic control for example. Being an idol, doesn't put lives in dangers... so it them having to do it isn't unrealistic. If you wanna be the best, you work like the best. 346 Pro doesn't strike me as a company that wants average (considering their like the settings version of an idol megacorp). Pushing the girls like this will prove if they deserve to be a Cinderella Girl.