Thanks Boston!

I am certainly not an expert when it comes to Amethyst relay settings but you are right about how filter works.

Filter reads from (and deduplicates) and broadcasts to a list of public relays so that you don’t need to make all those individual connections.

Filter also broadcast notes to 3 of the recipients (tagged users) NIP-65 relays.

Though filter will not accept notes directly from non-subscribers (and thus shouldn’t be placed in an inbox/outbox list, it will pick up notes that come through any of the public relays automatically.

Without knowing for sure, the way you’ve set it up sounds correct to me!