Thanks jennifer - that's what I figured! If I were to re-word my original question, I suppose I would put it to you all like this:
If we use OOTB Braze unsub function AND we turn on the list-unsub header currently available NOW in Braze; does that meet the requirement for one-click unsubscribe? (I don't think it does because as I read the documentation, it looks like current functionality is set up as MAILTO: and doesn't include an HTTPS URI).
If not, will the feature that's mentioned in the Note here satisfy the requirement? (Mostly looking for confirmation that Braze is working on product functionality to address this upcoming requirement).
Anyone using a custom pref center is going to have to build in custom header code to accomodate the one-click header unsubscribe link.