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Einhorn vs. Buffett on Moody's

You're combining answers to two different questions.

Einhorn is referring to whether Moody's ratings may have a bias, and the excessive level of trust that people give to ratings.

Buffet is dealing with Moody's as a business to invest in because of the industry barriers to entry and the increasing importance (even if misplaced) of ratings.

Both of them are right.