Andrew Gelman's blog has a discussion of Columbia cheating on its numbers reported to US News, which had a huge impact on its ranking. I don't know how far it extends to its Master's CS program specifically, but I feel that Columbia's ranking should be discounted entirely. This is quite unfortunate, as it has a distinguished faculty who take no part in this evil.

Link: https://statmodeling.stat.columbia.edu/2022/04/24/more-news-...