No. The Rock billed it as a reset. DC was never going to build around that failed property.
The studio was waiting to see how the movie turned out. Before the movie came out, I read from articles that Black Adam was going to reset things by shifting the universe around that property. That was long before the movie came out. I am sure they were waiting to see if the movie was a hit. SMART. The original pitch was for a multiyear plan that involved Black Adam and Superman (played by Henry Cavill) that would have led to a Black Adam vs. Superman showdown shifting the verse to revolve around the next 4 films. The studio did the right thing and didn't commit until they had seen how it performed.
They were open to it which is why they approved HC cameo. Remember HC after talking to the studio also announced he was returning to the role. He wasn't talking about the Cameo. After the JG hire......“I will, after all, not be returning as Superman,” Cavill wrote. “After being told by the studio to announce my return back in October". So, before the JG hire HC was told by the studio to announce he was returning. Black Adam cameo was supposed to lead into something else or HC wouldn't have been under the impression from the studios he was back.
Even Zachery Levi said the original studio plan was to have Shazam face off with Black Adam. The Rock nixed the idea, changed the origin story of Black Adam and the new plan was to have Superman face off with him instead. The studio supported the direction. So, maybe there was no official announcement but clearly the studio thought there was a possibility of going there because of how they handled HC and changed things for Shazam.