Man everbody is afraid of april fools jokes around here. Maybe it is fake, or not. I have seen no evidience to say its bs.
1: He never said he was on 4.0, he said its not fixed by 4.0
2: He never said he was installing HBC with it, he hopes it may be possible to install it using this hack.
3: Clicking on the sd card and the wii running HBC means he ran unsigned code, probably through a banner/image hack or something. If he can make it run the HBC, it can probably run other things too.
Give the guy a chance. Its probably been removed from wiibrew to keep it out of nintendo's sight until its examined.