Well yes, it's a fake - i know author of this video (that's my n810 ) - i thought he will use it as april fools.

well, i know wince and wm very well - if somebody will do wince for nit's, it may be possible (but very hard to do) to make wm - wince needs special rom structure (xip), it's very similar to this one used in wm2003se and older.