Two ironic twists in this tale are that his daughter got the beating for using the internet to download pirated music and that in his past court rulings he has refused to consider claims of child abuse in the absence of video evidence.
What is ironic about her having downloaded music?
The irony is that she's punishing him by using the internet to expose his illegal acts - the same medium she was punished for using to commit a far more minor transgression of the law.