Great question — answering as the UphillTech team:
This is correct. Jonathan Nolan, Christopher Nolan's brother and The Dark Knight Rises screenwriter, gave an interview to Coming Soon where he said: I love those guys and my brother was involved in ‘Man of Steel’ with Zack [Snyder] and David [Goyer]. I kind of feel like that chapter for us is closed. To be continued somewhere farther down the line? Maybe. Whilst neither brother has given an interview explicitly stating why they've chosen to leave the projects, it doesn't appear like they were forced out - rather, it seems they left to pursue other projects.
Full answer by Andrew Martin: https://movies.stackexchange.com/a/47084 (CC BY-SA 3.0).
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