Officials at the ministry's Center for Political Studies reached this conclusion largely based on the fact that Saddam was wearing glasses, and also because the Arabic he spoke was not very sophisticated, suggesting the speech was put together on the spur of the moment. And they think this means it was live and not taped? I think they're forgetting that there was a very good reason for Saddam to have been rushed when he taped this message:
He had to tape several messages.
One in which he gives the date as "March 20, 2003",
one in which he gives the date as "March 21, 2003",
...and so on.
This would all have taken a lot of time.
Saddam is too arrogant to pre-record tapes to be played after his death. That would be admitting defeat in advance.