They just accepted that they are a literal meme factory at this point rather than an idol company. Good on them for giving us the content we didn't need but definitely deserve.
The only way someone can be so unfazed is that he/she knew it was going to happen. Sora must be one hell of a Newtype or very much in touch with the Force.
I'd say it was more than likely all according to plan from the beginning. He's a 4d chess player who's been plotting this kind of "virtual idol" all from the beginning. Just needs to ease them in... For like one day. Then the next week and forever more, they all reveal their true selves.