I think there's two different things going on here.
They have reset all guilds back to level 1 because there's supposed to be a daily guild exp cap in place. So, you shouldn't even be able to hit guild level 2 until day 3 of gameplay.
The quoted text is in regards to one of the guild perks / achievements (I believe) - the one that increases character experience gained by 5%. Haven't double checked any of this, but I was reading about all of this earlier and that's the impression that I got.
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Explorer / Soloer+Small groups / Some PvP
MMOin' since UO beta, still waiting for UO 2.0 done right