nostr:npub1h49w8en79xty6j2pwgnpm3znjhyf767jua6xgt3kvyn3w80ms86s2z9kay you showed me this first.
Can you shed any light on it?
Discussion
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afaik, the main thing about a secret chat is that your messages will be sent and received to/from one specific relay, isolated. based on my experience since the relay is limited and specific the performance is better as well.
A specific relay is one of the factors, but the most important difference is that both parties use temporary keys, ensuring a certain level of forward secrecy.