ElumTools uses a tool built into the Revit API called the Analysis Visualization Framework (AVF) to display the calculation results in Revit. At the time of writing, Autodesk doesn't provide a way to display AVF results in AutoCad.
It is possible to export the ElumTools results to PDF or image files, which AutoCAD supports importing.
- Export the scaled view to DWG. File --> Export --> CAD Formats --> DWG.
- Isolate the calculation points grid from the same view and print it to PDF. Import into AutoCAD as a raster image, scale, and position it in front of the background.