After reading your comment I asked Stable Diffusion to create photorealistic images of a graph with three lines (similar to the smallest prompt in the article).

Here's the results of three attempts with slightly different prompts:

https://imgur.com/a/FqQT2Mk

As you'll see, Stable Diffusion

a) is perfectly capable of drawing graphs, and,

b) completely incapable of drawing a simple graph with three lines as prompted.