At this point, that isn't true anymore. There was social media when the parents were school aged. The world didn't start when you were 10 and the Internet is a half century old.
Being literate in something isn't just knowing how to use it, but how to manage it's use for one's self and for others.
Once you see the importance of it, knowing where/how to start to manage what kids are exposed to that is age or developmentally appropriate for them is entirely a different skill to meet and manage the digtial literacy of another human, especially a child.