The page for だって explains all three of its uses: Giving explanations and excuses, emphasizing “even” (like でも), and reporting hearsay.
But then there’s another page for んだって specificially that only covers its “reporting hearsay” usage.
Why do we need both of these pages? It seems to me like there would be less confusion if the んだって page was removed. The だって page already does such a good job explaining and contrasting all 3 uses, that having an extra page just makes the learner feel like they missed something or like it’s more complicated than it really is.
I’ve understood how だって works for several months now but even I was confused at the existence of both of these pages and had to spend a good 5 minutes reading through them and comparing them to make sure I wasn’t missing something.