That's just not possible. Light has been bouncing off biosignatures on Earth for as long as life has existed here. We can't hide those. We also can't hide the spectra bouncing off air pollutants. There's an ever expanding bubble of spectra racing through the galaxy announcing the Industrial Revolution.
Radio emissions are actually much harder to detect because they're weaker than all the light bouncing off the planet. Aliens aren't picking up TV or radio broadcasts. Those become undetectable a little outside the solar system. The signal strength fades (due to the inverse square law) to under natural radio background a little into the Oort Cloud. Only very deliberate high power and highly directional signals can be detectable at interstellar ranges.
The Dark Forest theory is just silly and I'd go so far as to say pseudoscience. It just doesn't make any sense if you think about it for a few minutes.
Radio emissions are actually much harder to detect because they're weaker than all the light bouncing off the planet. Aliens aren't picking up TV or radio broadcasts. Those become undetectable a little outside the solar system. The signal strength fades (due to the inverse square law) to under natural radio background a little into the Oort Cloud. Only very deliberate high power and highly directional signals can be detectable at interstellar ranges.
The Dark Forest theory is just silly and I'd go so far as to say pseudoscience. It just doesn't make any sense if you think about it for a few minutes.