Well, considering that The Muppets Studio is part of Disney Consumer Products & Interactive Media, it falls under the “Disney” banner, as it is not an independent division like Pixar, Marvel, Lucasfilm, Fox, etc.
Also keep in mind that they only announced the first crop of content for just the first year of the streaming service. And if it means having to wait a little while longer for new Muppet shows and films on Disney+, perhaps it’s a good sign that they’re really taking their time to make sure they get it right, whereas the 2015 series was rushed into production before they could work out the kinks, which is part of why that previous show failed. (It would also increase the likelihood of any new Muppet stuff being more successful, popular and profitable so The Muppets Studio can finally be able to sustain itself both creatively and financially and become an independent subsidiary like the others.)