Look, as I said above to be able to "demonstrate a basic level of knowledge commensurate with their documents" does not equate to "to answer any question from any of your high school exams". The critically important role of the CO is to determine objective DV eligibility based on the information provided by the DV applicant, checking in detail for possible inconsistencies and fraud attempts - therefore, as the Consulate would argue, cross checking documents with personal information during the interview process are part of CO's discretion and, again the Consulate would argue, in no way are going against the guidelines as provided by DOS. If this arguments would be made by the Consulate as such, I certainly would not disagree. But fact is that the Consulate does not even need to argue these points, so the only important point for DV folks from Ghana is how to go from here. What I, you or anybody else thinks, I am sorry to say, is absolutely irrelevant.
