I know I have heard many times that there is no chance that the Nitendo DS will ever be able to play N64 but look at his on youtube. http://youtube.com/watch?v=T-DUawYUtXo/
link doesn't work, but i can still answer the question. fake. there's a ton of obvious reasons, so just leave it at that eh?
I've watched the video you're talking about.. The guy just boots up a .dpg file, and pretends to play the game. (.dpg is a video file that can be run on NDS) Watch the video again. Note the file name on the file he boots up. It ends in .dpg
It could if the hardware was as compatible as some people would like to believe, however it would not then be an emulator. It can't because of the fact that it does not have identical hardware, and to emulate hardware using software takes a much more powerful system, and although the ds is more powerful than the n64 it's not THAT much more powerful.