I found the author and had a good conversation with him about the “Risk Landscape chart.pdf”. He – Lucas Everly, created it because execs in his organization were conflating risk appetite with risk threshold. He created the diagram to be an accurate visualization between: appetite, tolerance, and threshold.
We can reference this work and should cite him. He also gave his blessing for modifying it for our needs, which I’ve begun based on the conversations yesterday and via email afterwards.