Thanks for your patience in getting an answer back on this post. Region 4 (in Houston, TX) created the original tactile used for Example 10 of the Supplement. Here is the response that I received, along with a couple of attached files (for Tiger).
"Debbie Holliday is the artist that made this graphic. She says the grid and shading were done on the Tiger. The shading was done with a pattern and then manually omitting every other dot. She saved a square of shading and then pasted it in where she needed it. She removed shading as she needed it around numbers and next to diagonal lines."
Hope you find this information helpful! Thanks Region 4 for the explanation!!