> The description still contains: "Age-restricted channels are exempt from the explicit content filter."

Wait! This does not mean they do not scan it. What I understand from that statement is that they filter explicit content, as in they prevent it from appearing on the user's screen.

When you enable the "NSFW" mode, you tell Discord "it's okay, don't filter out anything". But Discord probably still scans everything.

So that makes sense to me: if you don't validate your age, then Discord will not allow you to join channels that disable the "adult" filtering. I can personally live without adult content on Discord...