Indeed its a model. A somewhat accurate model. BUT An outdated one
Like I think about it like this .
We have newton's model of the gravitational equation, right? Its just a model .A somewhat accurate model... But An outdated model.
...Then we have Einstein's.... which is far more accurate.
And who knows? Who is to say thar einstein's model is COMPLETELY accurate? There could be faults in it we havent encountered yet