At any rate, this website confirms there is a guild. It’s just wiped from in-game. I would imagine there will be a fix to this shortly (hopefully). The GM logged in just in case to see, as there were some in chat saying they had an issue but they were the GM and they were still in guild.
If this does happen, I’d recommend not reforming the guild…
I’ve seen some dodgy things with patches, I’ve seen guildbanks wiped, mail wiped, etc. I’ve never seen a patch wipe entire guilds from existence.