I think you are putting the cart before the horse: the code was written intentionally, i.e. someone first had a thought, and then fleshed it out in the code (and maybe had forgotten all about it the minute later).
When LLM generates code, it also has a "thought process" of sorts. But it's very different from the one humans use. An LLM generating code may pretend to have a thought process similar to humans (when asked to elaborate on the reasons the code is this way or the other), but, fundamentally, it's going to be a lie, because the real reasons this LLM created the code in a particular way is very different, and is very hard to grasp for a human, even if they are familiar with the problem (there were some attempts at explaining LLMs "thinking" that would end up looking like heatmaps and other weird things that are useful for debugging them).
Imagine that instead of a stack trace, the program you are debugging spits out only the memory dump with values in registers etc. (the gibberish-looking part of the coredump file). You'd be in a similar situation receiving the "true" explanation from an LLM generating your code.
When LLM generates code, it also has a "thought process" of sorts. But it's very different from the one humans use. An LLM generating code may pretend to have a thought process similar to humans (when asked to elaborate on the reasons the code is this way or the other), but, fundamentally, it's going to be a lie, because the real reasons this LLM created the code in a particular way is very different, and is very hard to grasp for a human, even if they are familiar with the problem (there were some attempts at explaining LLMs "thinking" that would end up looking like heatmaps and other weird things that are useful for debugging them).
Imagine that instead of a stack trace, the program you are debugging spits out only the memory dump with values in registers etc. (the gibberish-looking part of the coredump file). You'd be in a similar situation receiving the "true" explanation from an LLM generating your code.