Stylisation is not only about the style; it can also help you to define the shape and details of your model.
From a stylisation perspective, your model can be:
Not realistic → Realistic Simplified →Detailed
From the style perspective:
Unreal → Real Strict → Playful
Low-poly stylisation was one of the most popular a little while ago.
If we take a look at most of them, we can say that this is Not realistic / Simplified stylisation
But from a style perspective, it can be Real / Playful.
How do we understand when it's real or not? If you look at it and you think it might be a photo but not 3d art, then it is Real.