I assume you’ve turned off “allow Bluetooth devices to wake this computer” and “wake on network access” in system preferences? Those are the only things I can think of that can randomly wake up macs
Oh yeah, I’ve turned every single possible thing off. It still randomly dark-wakes. And then, when it does, it will sometimes get into a doom loop of scanning the network and refusing to release its power assertions, meaning it won’t go back to sleep. Eventually it will hit a thermal emergency and then shut down.