"Now we can replot the pyramid and see why the uniform colormaps are better than their non-uniform counterparts. The top row is the same as above. The bottom row shows the pyramid function using ehtplot's uniformized colormaps, while inferno and inferno_r remain the same."
In Out[8] and Out[9] in Section 7 it looks like the top row has the uniformized colormap plots and the bottom row has the original plots.
Thanks for an interesting and thorough article