Conflating DCT-based compression of audio data (like MP3) to dynamic-range compression of an audio signal (as done on an audio compressor during production) shows how little your grasping the problem.
It doesn’t work very well for TV in my opinion. Ads still sound louder as they are mastered differently.
I’ve no skin in this game, and no desire to ever see or hear ads. I just hope we don’t kick off a “loudness war” for TV/Movie audio by mandating the average volume across entire programs has to hit some high level like modern music or ads have.