This Starbucks isn’t unusual in terms of construction for a free-standing store plopped-down in a parking lot. These sorts of places are little more than a lightweight metal frame covered in insulating panels, then covered over with a thin stucco-like material. It’s cheap and quick, but it’s also very lightweight.
It should also be noted that the tornado didn’t actually hit the Starbucks. It passed overhead. If it had actually hit it, those panels wouldn’t even be there. Or the cars.
FWIW, I live in Indiana and Wednesday was kind of hectic. We’re more-or-less accustomed to tornadoes, but twisters this late into the summer is not all that common here. Spring is the usual time for this stuff. For example, Palm Sunday.