To be exact, it's an ages-old snub technique from good ol' Vanilla/HHC times, which was used by the players who were enjoying "truly shotgunning" their foes with codenames. Basically it's just shooting with wepgroups with none of them being actually active (turned on). I also recall that being used somewhere during 86's here, never proved to be much useful though, but a lot better than the built-in "Fire Forward" command.
And as a side-note, it's a nice and gentle move to reveal your techniques to the public, glad to see something like that happening.