As was said, the earth grid is made up of many, many layers right down to the atomic level spacing. The two sample grid layout patterns LAYER 1 and LAYER 2 are an example of how this layering changes the grid line spacing. The GRID longitude - latitude values used are true calculated grid line coordinates - they were chosen to illustrate how one layer would compare to another layer just below it. These coordinates are for layer 4 grid spacing (on the layer 1 graphic) and layer 5 grid spacing (on layer 2 graphic). The grid layer for the grid in the Austrian article would be grid layer 12.
The fact that the grid line spacing changes by multiples of 3 is not widely known, mainly due to lack of broad enough research into the subject.
These illustrations are fully compatible with the research referred to in the Austrian article. In that article they refer to the diameter of the center vortex as being about 8 feet (2.45 meters). That is the vortex diameter of those grid squares which are spaced only about 50 feet apart in a checkerboard manner. Each time you step up the layering scale that center vortex size increases until you get to the vortex size of those grid junctions listed in the grid node table - which would be HUGE - likely "miles" in diameter. The illustrations of the two types of grid junctions (red and blue) show the rotational direction of the vortex at that junction.
NOTE: You might find the grid layer diagrams a bit large - that is on purpose. I wanted to convey the relationship of the vortex junctions and layer spacing clearly.
(unfortunately I couldn't find the pictures from these layers. janitor.)