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It's compression. (As in audio processing not data storage)
Loudness is a perception thing. Pure decibels don't tell the whole story about how your mind perceive audio.
It's the same principle as the "loudness wars" in music.
Audio equipment still has upper limits, but music is produced to sound louder.
This is also why modern standards of measuring loudness is more complex.
But in the end this is sort of just being pedantic. Yes commercials make their stuff sound really loud and will always push up against what ever limit you put on it.
Movies and TV shows care more about quality of audio and dynamic range (that's is sort of the issue made funny in the comic above, when your equipment is unable to create audio clarity at the full dynamic range something is made for)
Actually quite a few TVs, soundbars, and audio receivers have a "night mode or quiet mode" that will compress or limit the dynamic range of what you are watching to avoid this scenario
(Yes I know... I'm ruining a perfectly good funny comic :P )
