Not really true.

You can have a book where in the last chapter you have a phrase "She was not his kid."

Knowing nothing else, you can only infer the self-contained details. But in the book context this could be the phrase which turns everything upside down, and it could refer to a lot of context.

The whole book could be the surrounding context, not just a sentence or two, and I think that still fits with the point I wanted to make - that written words are more linear or in the same plane compared to code which is more "multidimensional" in a sense, when you start to consider the reasons behind the code, the order of execution, things being executed multiple times, etc.