Eddy3D , "Decompose and scale up mesh"

Hi, i have a question about the Eddy3D templates.
The “pressure on building facade” includes in the step 4 “Decompose and scale up Mesh”.

Inside the cluster the Brep is decomposed on their faces and moved out and then scaled. All this procedure I asume is for obtaining some probing points.

I dont understand why it is necesary to do this proccedure.

This cluster is in order to test point near the surface but not in the surface?

I tried probing points without the move and scale and i get wrong results.

Thanks in advance for your help!