Theoretically speaking, not all water use is renewable like rainfall, you can in fact deplete aquifers, and ancient near east in fact desertified due to unsustainable water use. Ditto for land use, you can in fact erode and degrade topsoil, ancient near east etc.

Skimming the report, it doesn't do reasonable job of taking land use and water use into account, but in principle, there's nothing wrong with taking unsustainable portion of land use and water use into account.