We have to be really careful with things "seen in a interview" and even more things "read on tumblr".
Unless you (or someone) knows advanced japanese you have to remember that translation can sometimes be tricky especially if the translator only has 1-2 lines of text to put as a subtitle on a video.
That being said I don't think what you say is a problem. CALESS supported them to some point but it doesn't mean the girls couldn't train themselves outside CALESS. Also even if this was project from CALESS/KITTY it didn't mean a full contract from the start with lots of money and intensive training in a professional studio with experts. They were very young when it started and this was surely not a short term project anyway, they took their time (but were still fast ^^).
They started from 0 so if they wanted to improve they couldn't just train a few hours per week they had to train a lot. That's how I think they rented the studio in the building that had the SCANDAL neon sign.
Maybe the real support only started later, not right after the audition, but more for the Shiroten days. If that timeline ([You must be registered and logged in to see this link.]
) is right then it's after Shiroten that things started really, before that they were mostly an amateur band training.
Fact is we know nothing on how or how much they got support early on. Because there was an audition and request for a girl band, and because they had some help for Shiroten doesn't mean that they were a professional band at day 1 with money support.
They formed girlsband and then things quickly evolved with RINA joining and they took the name SCANDAL, they already had a liveblog but in the end this doesn't mean they had a professional staff and all that ^^
So the whole "we had to rent a studio and put all our money in it" is surely true. It's not because you have parents that they can afford to pay everything for you. Back then this band was a huge opportunity but they were still young and not good at instruments =P
What I mean is that they surely didn't get huge money checks from day 1 and had to work on their own to improve, CALESS/KITTY may have supported them in some ways but the girls still had to work and prove themselves. I think later on when CALESS/KITTY saw their improvement and all they supported them much more and the real things started. But at the start I really doubt they had a huge support and were mostly like many amateur bands that had to work alone and pay for their stuff obviously.