Yeah you wouldn’t want to label those axes so they’d provide any useful information. That would be out of line.
The point of the chart was not to communicate specific data points, but to communicate a concept. But if you are asking me, the Y axis begins with Creation between six and seven thousand years ago. The X axis is meant to communicate genetic degeneration ever since the fall. But speaking of not labeling axes, it seems Darwin himself was in the habit of making graphs and charts without data points to communicate the CONCEPT of evolution. Is the following chart from Darwin's "Origin of Species" also "out of line"?