He had already expected the things that Arishem wanted to inform him.
The government indeed raised its vigilance against the cult and is now developing ways to increase its security. Also, the City Lord indeed received some heat from them because the city nearly got destroyed.
They also submitted the 'drill' to the researchers in hopes of discovering ways to counter it. As of now, this was their biggest project since a tool that could siphon vitality from the Ley Lines was something they could not permit to exist.
Truth to be told, it wasn't necessary for Arishem to tell him all of this. Cedric had no plans on entering the murky waters of politics anytime soon and frankly, he could already predict his actions based on the information they release in public.