The purpose for this tool is to rename the textures to a companys naming convention for publishing purposes.
There are no export name formatting options out of Speedtree at the time of writing this.
After the asset has been exported you see that in the folder there would be multiple file types. Image files for textures(.exr / .jpg / .png), a 3D geo file (.abc / .obj / .fbx) and finally a .stmat file.

The .stmat file contains the information for importing geometry and its lated textures to recreate the materials and assignments for the asset in an XML format.

Once you've renamed the textures you have to update the .stmat file so that it the textures correspond to names the associated in the .stmat file.

The UI was created in QtDesigner and the code was written for pyside2 compatibility as that was the requirement of the studio to integrate it into the pipe.