Cycling Plus review was not a fan of the low-end Campy wheelset with G3 pattern on the front (Zonda?) as they also found the larger sections of unsupported rim to be detrimental to rim stiffness and ride quality.
If it was the Zonda they tested it on then it sure takes an elephant to deflect those and if so then I doubt it would have anything to do with the used spoking pattern.
But maybe they were talking about a frontwheel with G3 pattern? Those have been, or maybe still are, around and that is no place to use a G3 pattern at all.
The G3 patterrn is one of the many variations on a spoking theme first invented by good old Gipiemme who, around that era (1970/80?), were building a lot of the Campa wheels.
Of all the odd spoking patterns only the G3 one was kept alive by Campa. Another one that pops up occasionally is the paired radial spoking pattern (aka G2).
Personally I don't think there's much difference between a G3 pattern and a 2:1 one in practice. The latter may have a more evenly distributed spoke arrangement, the former sports better tangentiality on the drive side.
Of course, the visual aspect of the G3 pattern is utterly more marketable....
P.S.: the G in Gx stands for Gruppo. So you have Gruppo de tre (G3) and so on and so forth.