I've thought about it and I think I agree with you. I've only taken a little advanced math and I was able to understand most of it.
However, I still don't agree with the OP that that makes this presentation pointless.
However, I still don't agree with the OP that that makes this presentation pointless.
So, the first step should be to NOT start with the "Advanced" standard :) look for block cyphers.
And if you found your self blocked on this little presentation during the non-sense (and not explained) column transformation step, this may help you:
http://docs.google.com/viewer?a=v&q=cache:H0QmIsUIBbkJ:w...
Understanding AES Mix-Columns Transformation Calculation Kit Choy Xintong University of Wollongong,