Not being generated implies some intent behind what's and how's being written that you can read into. Being generated means it's just driven by random chance and the poster may or may not have cared to redact it, making attempts at interpretation futile.
This applies to code just as much as it does to prose.
Where it comes to AI generated output, that mostly depends on the input. If you prompt with specifics of what you want and go into detail, you are much more in control of the output.
If (I’m speculating here) that’s the real question you wanted to ask, it’s perfectly okay to ask that.