Well what now, first you point to the The Waterloo Companion and then you ignore the info in that book yourself.
The Companion notes that the IG is still arriving at 11:30(p 161) and the 4th division was still not in position what simply means they are still marching at 11:30(p. 162).
Don't get me wrong, it looks like that scenario needs some adjustment but still calling it and the whole game "fantasy" is not only too harsh but simply way beyond any reason.
PS I not sure the expansion pack gives any improvements but maybe one should install that too to make sure he gets anything that is available.
Download here:
http://www.hpssims.com/Pages/Updates/up_...NapBat.asp