Ignoring the author's culture includes their language. Consider handing just that text to an alien along side a few thousand similar, but randomly generated texts.
I'm just saying the main context I'm seeing here is goalpost moving.
The written word is a medium of exchange not an independent artifact. If you read a recipe with "Add 3 cups of water." the author's intent is to tell you how to make something edible. So, it means poor 3 cups of water not take three 1 cup containers with water and add the containers and water to the mixture.
You can find examples like this in any lengthy text. But, death of the author is not about exploring that kind of grammatical wordplay it's about shielding the critic from reality. Thus, intent is both considered and ignored when it helps them.
Now, that does not mean the Author is infallible. But, discounting the authors intend is like ignoring a books sequels or even the second half of the text. https://www.youtube.com/watch?v=nCeFbK-WEVE
In the end by discounting the author you are left with the lowest form of criticism, how did that make me feel. Which is not actually about the text, just the person writing.
Getting back to your phrase. Someone can assume line noise has meaning, but they are simply mistaken.