> I think what he was referring to was the fact that the graphs appear to be hand drawn.

Yes, and so was your parent comment. Some people have suggested that the hand-drawn appearance communicates imprecision. For example:

> The rough, seemingly hand drawn nature of the graph provides a visual hint as to the imprecision of the results.

https://www.chrisstucchio.com/blog/2014/why_xkcd_style_graph...