I think you might be on to something there. So many youth are disaffected and every vote counts so maybe that was why the Biden team decided to do it.
If Trump did the same thing to reach out to say 18-24 year olds, who would he have the interview with?
I'm guessing the goal was to reach 18-24 year olds who don't follow politics and convince them to vote. I don't think her past really matters in terms of the election.