The numbers are correct. These numbers have been reported by GungHo (the company that has made Puzzles&Dragons). They have to report their revenue numbers as they are traded in the Osaka Stock Exchange. [1]
Also these are April numbers, recent revenue estimates will be even higher as the game is now climbing up the top grossing charts (iTunes) in US too.
[1]http://www.gameskinny.com/bdbci/gungho-made-376-million-a-da...