It's still used for filming every once in awhile, but the theme of the rides built in recent years has nothing to do with the Studio theme. The additions over the past decade have only served to get rid of "Studio" theming actually. Fallon, F&F, Transformers, Fear Factor closure, etc all replaced or removed Studio theming. Also, the "Soundstage" buildings in question as a part of the Minion Land have never even been real soundstages.
Yes, there is a Studio next door to the park. There's also a Studio next door to IOA. The Studio being there doesn't mean that's the theme of the park. Just because "Studios" is in the park name means nothing Universal Studios is simply the name of the company's film branch. If "Studio" being in a park name meant anything then DHS is a Studio park. We know that's not true. Why is it so hard to accept for USF? To me it's plainly obvious.