Since it says 'within 10 days' it's probably not related to her voicebank. It's probably related to their CDN (content distribution network) or whatever download/sales service they have. I'm sure Ruby's all ready to go, PFX is just waiting for some process to finish up.

Edit: And I don't think Prince Syo made a mistake.. he was likely given a solid date, but sometimes things just happen. I'm sure he didn't mean to mislead anyone.