I don't think noStrudel implements this yet. Amethyst has had it since last september or so.
Discussion
If Amethyst has already had this since last September, why is it being announced now?
This is just the NIP merging event, highlighting that the feature is stable so that other clients can start coding their support for it.
Oh nice! 🤙🤙
Okay maybe I am thinking of channels in... I think their security has been improved since @supertestnet s Anigma telegram clone.