[mrow84]

> If you make tangential observations the conversation may move tangentially.

You (presumably) have agency, and could have chosen to answer the main question rather than labouring your misconstrual of the parenthetical.

> Areas of 2D shapes tend to represent some kind of quantity ...

They sometimes represent some kind of quantity, but here they don't, and despite my repeatedly asking you have been unable to provide any interpretation of what that quantity might mean. Lots of other people seem to be able to understand the graph just fine - perhaps you simply dislike the popularly stated inferences and are looking for holes to pick?