Got to thinking maybe you were still in school and hadn't covered determinism yet. Here is old school stack overflow answer that is short and clear.

The environment does matter. I think in your original objection, you were executing the code in different environments.

https://cs.stackexchange.com/questions/38152/what-is-determi...

And to the point of the original article. Each human interpreting natural language is a new environment. Each brain is a new compiler with different outcomes. Thus the ambiguity. Natural language isn't concrete enough to always have the same result when processed by different humans, or AI.