it should be simply refrased from " +1 Free Daily Labyrinth Chance " into "+1 additional lab chance".
however, considering how bad that reward really is and how hard and how much money has been put into the guild to actually get there, the right thing to do should change it into a real free lab round as in "your first round costs you 0 stamina". therefore you would pay 30 stamina for the 2nd, 60 for the 3rd and 60+10gem for the 4th... and so on and thats where your VIP levels get gravity again. but having to work and save like a year for it and then having no advantage from it i intend to agree on calling it "misleading", but maybe its just not thought thru enough from the developers and it was "free" intended from the start, just programmed wrong... and later on no one complained about it because there is only a very few guilds that went this far.