Is this true?

Champion Mastery
Champion Mastery is a progression system which tracks a player's aptitude and experience with each champion. At the end of every game, players receive a grade which scores their performance in comparison to the whole player base in that respective champion and position combination.
On this wiki page it says you need 33000 mastery points to get to tier 6, and 46800 points to get to tier 7. Is this confirmed? Or is it calculated using a formula?
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