The reporter who covered the fire in Usonia told me via email yesterday that he indeed got it wrong originally when he reported that the house was designed by Frank Lloyd Wright. He said the fire chief had told him that (a great example of bad sourcing). The story has been changed but the headline still says "Frank Lloyd Wright-designed house."
There's credible information about Usonia and the house that burned in the comments to the previous post. Thanks for keeping us informed!