The syntax doesn't seem to like LA and CHI servers. The listed syntax on the page must be outdated or something as well as the addon.

all("(la or chi) and (rio > 600 or riomain > 800)")

This kind of setup is what I was using, for example. I tried using usp, usm, etc but those aren't the names of the servers in the addon so nothing gets shown at all though it doesn't throw errors and break using them unlike the example I have given.

You are right, premade region integration was outdated. Thanks for reporting!