I think a partner would be a material fact, and I don't think the SEC would let them keep that confidential, and even if they did, what justification would there be to keep it confidential for 10 years? Material facts MUST be disclosed within a reasonable time.
Most likely they want to keep the names of the note holders confidential. Note holders would not want the public to know who they were. Would you? These type of investors are very private, and don't want everybody knowing their business, including shareholders that they may represent. Some of these people make tremendous returns. Remember the stir late last year and early this year about all the money the hedge funds made?