You're both way off.

I asked four of the youngest people I know (ages 19-22) what Chernobyl was and only one knew. And only because of the TV show.

You have no idea how little the average youngster cares about stuff they didn't personally experience. Almost nobody is reading history articles on Wikipedia for fun. It's just Tik Tok, Insta, and Youtube.

For the majority of them, certain subjects will just be mentioned in passing 5 minutes in a history lesson, and it exits the student's brain within days, if not as soon as the bell rings.