Judging from the comments on YouTube and 2ch he's putting some real presure on the girls especially the new members. He's comparing them with Morning Musume, since they are in the same situation with 2 original members and new members. Specifically pointing out that MMs tour is already sold out and S/mileage's tour isn't. He's clearly pushing the girls to do better to change this situation.
Since Kana has been behind since the start this message hits her more since she will most likely think that she''s holding the group back.