Strategy Guide's make mistakes, It's unique.
Also thats like asking why the Alien Blaster is just Alien Blaster and not Alien Laser Beam
First of all, why would you think of "Alien Laser Beam"? It doesn't shoot lasers, it shoots bolts of advanced energy.
Second of all, the strategy guide put it in the normal weapons list, if it was unique, it would not be there, it would be in the unique section, is that still a mistake?