The other answers give reasonable rationales for why a movie script writer might require sales people to know coding. Whether Google does or not, I don't know, but it is an extremely reasonable requirement, especially for such a company.
However, being a multi-decade software engineer, requiring experienced coding goes well beyond snobbery, tradition, or basic product understanding:
- drastically improves communication by providing a common frame of reference
- provides a common lexicon
- expectations begin within reasonable limits on both sides (sales and engineering)
- improves sales perception of what is possible and impossible, and provides insight into how difficult (costly) a potential customer's application might be
A joke I heard in the 1980s may shed more light:
Q: What's the difference between a used car salesman and a computer salesman?
A: The used car salesman knows when he is lying.