Not to downplay what is happening but I want to set the stage here - looking at their attachments, I am not seeing that "every" picture is gone. I am actually not finding any which are under attachments that are gone. There are several in there which are cross-linked using "Insert Existing Attachment" and those are still showing.
As the user stated that they delete images, I would ask them to find what they uploaded in gallery with a broken image in a post. Sometimes people don't realize that if they delete the original item, it will delete everything. So, if the original image was uploaded to gallery and they wanted to delete that but keep the post, that's not possible.
The second reason for doing this would be allow us to find the core image and the linked image because right now, I've done a few searches and can't find the core image in Gallery for this user. This way we can investigate further what happened if the above scenario is false.