She grew up in a family abusing screen time, centering the TV above anything and anyone. That was very bad, as she readily admits. How then does it make any sense to look away when a similar or worse issue is affecting young people?
Instead of preventing it from happening twice, you focus on "rubbing it in", because two wrongs make a right?
Further, from a pragmatic point of view, the comparison makes zero sense. Nobody cares how much TV the elderly watch because there's little to ruin at this point. They're past their productive years, so it doesn't matter from an economical point of view. For most it won't affect their dating chances or ambition to start a family. It matters little (or at least less) for their health, as they're already in winter.
For young people and society as a whole, these things matter far more. I don't know what the proper regulation (if any) would be for screen time but let's at least establish that the stakes are a 100 times higher compared to an old guy watching a stupid TV quiz.
The nature of the screen time is also incomparable. Digital is far more addictive, radicalizing, privacy-invading and exploitative compared to TV.