Is it possible somebody is confusing Arba Kehillos with Sheva Kehillos? Sheva Kehillos were 7 communities in the Austro-Hungarian Empire. One of these was Mattesdorf, where the Chasam Sofer (Rav Moshe Sofer) had his Yeshiva. This would fit in with the discussion.
Could be since the council of the 4 lands predates the Chasam Sofer as well. It was disbanded in 1764 and the Chasam Sofer was born in 1762