Unlocking Champion level 6 & / with IP

In this "ask riot" thingy http://euw.leagueoflegends.com/en/news/community/q/rgm-ip-and-tons-damage-ask-riot They said, that you could use IP to unlock you champion mastery level 6 or 7. Now, did I miss something vital here or is that bullshit. Because the way I see it work is still solely via blue essence or hextech shards. Please clarify {{sticker:zombie-brand-clap}} I didn't know the part about buying champion shards with ip yet. Thanks a lot for enlighening me :)
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