I think the guys in the video did really good job explaining otaku terms. But I wasn't sure "Tsundere" and "Burikko" is right. In the video, the maid girl only showed "Tsun" which means to be ignorant or act as if you hate the person. "Dere" part is where the girl shows the feeling of love or like. "Burikko" is someone who acts too cute. Age doesn't matter. No matter cute the girl is, if she was acting cute too much or with fakeness, then she is Burikko. But it really depends on how the person gets it.