I just finished the October challenge and got 210 extra leetcoins. Shouldn't this be 310 extra leetcoins?

This is what the official post says: "Completing all 30 non-premium daily challenges will be eligible for 2X the reward...".
Each daily challenge gives 10 points. So total I got was 31 * 10 = 310 coins. So for 2X, there should be 310 extra leetcoins.