Perhaps children under the age of 8 traveling alone are not allowed to sit in F is the new rule?
I also cannot imagine a blanket ban would last and wouldn't agree with it even as someone that does otherwise believe in adult only spaces in hotels / restaurants etc. The adult, ahem, local passengers who don't seem to believe in the existence of headphones and watch videos / do calls on speakerphone are far more vexatious than any children who don't know better...