I just wanted to let you know of this program I found on my search to extract some ISOs that were exact copies of discs rather than xISO. Difference is that in an exact replica, the video layer is also included. These ISOs are the ones that are referenced through Redump. Unfortunately, it is only in French, but it's simple enough to not need any text.
Found it here: https://digiex.net/threads/gx-xgd-extract-v00-10-10-xbox-and-xbox-360-iso-extractor-ftp-uploader.11885/
Included it in this post in case the link goes down
GX.XGD.Extract.00.10.10.zip