I can verify (having played a good 1/3rd of the game) that it is not in fact a demo disc but the full game.
how can you be playing the game if it doesn't work with a certain modchip (cyclowiz) unless you have a diffrent modchip? and i also heard that the torrent that was uploaded was deleted so no one can get the game now.
There's these places called gaming stores that have demo units with Mario Galaxy. See neogaf.com/forum for impression etc.