Let’s move everything related to MultiDataModel to this Model works but MultiDataModel doesn't - #10 by dan21c 5 so we can discuss it there.
If normal deployment works we can “close” this.
Or does normal deployment with your model.tar.gz not work?
Could you share how you created the archive of counterargument.tar.gz. Sometimes the structure is is
model.tar.gz
   - model
        - config.json

That way there is an extra folder and SageMaker might not recognize it.