While Big G’s long-term goal is undoubtedly to build a “huge network of all Android devices” capable of supporting the improved Find My Device app, the ability to actually locate an Android phone when powered off is likely to be exclusive to the Pixel 8 family at first.
Purportedly called simply “Pixel Power-off Finder”, the feature will almost certainly require special hardware to keep a phone’s Bluetooth chip permanently enabled, and for the time being, it’s not clear if the Pixel 7, 7 Pro, or any other Android devices available today are equipped with the necessary components to make something like that possible.