You should be able to fix that error by doing a full unconfigure with ACUConfig.
Acuconfig.exe Unconfigure /Full /AdminPassword yourpassword
Here are a few good links for reading up on AMT:
AMT8 Start Here Guide
AMT8 Intel vPro Technology Guide
SCS8 info on Expert Center
Also, you're right about the section for exporting XML files in the Intel Setup and Configuration Software Deployment Guide. This section needs to be updated.