It uses ext4.py parser which is in pys/ folder, and saves fs_config, filesystem_contexts and size of image. You should use extractor.py to extract your images. Use fspatch.py to patch your fsconfig to repack images (this is important).
means it will extract your images like superman.
If you do that, the only thing you will get is a bootloop. SeLinux & UID & GID's are important for Android so you need this script if you don't want your phone get bootloop
means not ready to use