Another effort at explaining away the Fermi Paradox. We are alone, and they know it, but can’t accept it because... God becomes a reasonable answer.
Exactly.
Powerful aliens are a God substitute, in many ways.
100 billion stars in our own Milky Way Galaxy. 2,000 billion galaxies in the universe. And we're it. We lucked out. Makes winning the lottery look easy.
The more statistically likely explanation is the universe, and our own galaxy, is teaming with life. Much of it may be primitive, or even if complex, such as whales, it lacks our strange curiosity to explore.
Of those alien worlds where there is an innate desire to explore and develop technologically, those who have "made it" to interplanetary travel are likely using technology so beyond our level of understanding that it would be like explaining the operation of a cell phone to someone from the Middle Ages.
We can't detect these alien civilizations because we're at the technological equivalent of using signal-fires or drums for communication and wondering why we don't see the alien equivalent form of communication.