rijndael question

On the rijndael page I see this note below the optimized code link :

IMPORTANT NOTE ! This code was written in order to clarify the mathematical >description, and to run the statistical test. Without modification, it should not be used to encrypt files, or for any other application.

What exactly does this mean? The code is not correct and functional? Mike http://www.esat.kuleuven.ac.be/~rijmen/rijndael/