Roger,
The Dead-i is trying to explain that most of the files are not even hosted in the dictionary of your website. In order to request for unmetered space, all the files from your "census" dictionary should be transferred to your public_html folder where it contains your website you are hosting with x10hosting. If you transfer the files to your website I am positive they will upgrade your space no problem. As stated in the TOS, x10hosting is not for hosting files, but must be used for the purpose of a website. I am assuming Dead-i is saying is that your space on your website has more than enough room to be transferred to your domain file. If all files cannot be stored you should transferred most of it so you can request an upgrade.