This is bunk, there’s plenty of science to back up that having a safe space as well as unsupervised time is highly beneficial to healthy development in adolescents.
In several countries, the parent’s behaviour is illegal and abusive, and would engender state child protections.
The weird notion that a child can’t stop the abuser is somehow making it not abuse is sycophantic and, if acted upon, abusive in itself.
I use Newpipe, it’s not as good as Vanced, but better than reVanced. And good enough that I recoil in horror at the stock app.