It is ineffective because it does not provide a logical reason for opposing the counterclaim.
"While the proof of a link is debatable, what is not debatable is the foolishness of allowing children to choose whatever video game they would like, since it empowers children unnecessarily." This rebuttal does not have a logical reason ; it is an opinion. The underlined words represent the speaker's opinion. Besises, the speaker has added an idea which has not been aknowledged in the counterclaim: " to empower children". In fact, the counterclaim refers to the idea that adults should supervise the videos that children would like tp play.