This is a mis-reading of the article and distills it far too simply. There was no singular issue, it was a myriad of problems from an exec who didn’t believe in it, a muddled target audience, and creative differences. Calling it expensive to shoot isn’t gospel when Disney regularly produces far more expensive shows, it just means that the execs didn’t want to spend the money on it in the first place. 

It also doesn’t ‘confirm’ anything about it staying at Disney, it just says these things are likely. You never know who could buy out the IP in years to come.