Pretty much. We set the cell sizes (along with growth rates and size function settings) which combine to give us a mesh. We can then look at the mesh resolution, cell quality, cell count etc. I suppose the density could be measured as number of cells in a given volume (you built the CAD so you know the volumes, or take it from the software).
Many papers are trying to show an application or technology. Some aspects of the work may not be well explained, and this could be by deliberate omission if they're trying to hide something or there's an assumption that the audience will know. Note, if you're taking data from a single paper look to see what else the authors have published. I've had papers published in Pharma journals where we had to explain the technology fully using very simple terms: publishing essentially the same work in a CFD magazine meant we could summarise the CFD part (the audience understand it) but had to really explain the results.