It's disciplined because you delete the post even though you will lose rep by doing so - i.e. you actually care more about answer correctness and relevance than rep (or, as smackfu says, you care enough about badges that it pushes you over the line (gives you enough incentive to delete your answer, knowing you will get an extra badge out of it).
From What is the purpose of the “disciplined” badge? where there are other answers that might be worth a read, there's many reasons a post should be deleted and this gives an incentive to do that when it is justified rather than thinking too much about your reputation loss.
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