Let's run wild some imagination. So 500 million light years as distance, meaning it started at least 500 millions years ago. Dinosaurs weren't existing back the

Let's run wild some imagination. So 500 million light years as distance, meaning it started at least 500 millions years ago. Dinosaurs weren't existing back then. Imagine a civilization which has this energy output that is detected 500 million light years away. Wasn't some quote where a type 4 civilization technology is indistinguishable from natural phenomenons?