Okay.
Just to be clear, this user has a large number of unassociated attachments. They are generally attachments that have been uploaded, but haven't been associated with any content.
For example, if I uploaded a file to this reply, but never posted the reply, the attachment would exist, but it would be unassociated. It becomes associated when the reply is posted.
Would you say it's typical for this user to upload attachments that are never associated? Worth noting that unassociated attachments are usually deleted after 24 hours.