Not necessarily. It might be that this effect is real (this was a computational simulation so an experimental verification is needed.) and needs to be accounted

Not necessarily. It might be that this effect is real (this was a computational simulation so an experimental verification is needed.) and needs to be accounted when doing cosmology. But it might very well account just a part of the redshift, and the remainder then needs to be accounted by something else, the default explanation being the expanding universe. Edit: A clarification: I'm not an expert.