I understand the approach you took on that. This is also expressed in the Rhino Help: Displays the absolute value of the mean curvature. It is useful for finding areas of abrupt change in the surface curvature.
Unfortunately this only works well on synclastic surfaces i.e. where the Gaussian curvature is positive at any point on the surface. Like shown here on this ellipsoid:
But if you inspect the mean curvature on an anticlastic surface (overall negative Gaussian curvature) like the hyperbolic surface below, then it appears that the center of the surface has no curvature, while the edges (which are actually the least curvy areas) are shown in red.
Mathematically this is correct in a sense of mean curvature (edit: more or less: red should be negative), but it does not help me to find the areas with most change of the surface curvature like indicated in the help file.
Really confusing it gets on a surface with mixed positive and negative curvature.
I think the best way out of this dilemma is to display the Mean Curvature like David has shown in his linked post.
Additional you may invent a curvature analysis which supports the initial idea and displays the amount of change of curvature – but this can be tricky