I think they are discussing nip44, which does not involve metadata leaks issue. However, Amethyst and 0xchat use gift wrapped + nip44, which can prevent metadata leaks.
Does it leaks IP?
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Indeed, leaking IP to the relays occurs, and I think simplex might also leak IP to their servers. However, you can use a VPN or the Tor network to prevent IP leakage.
We are too earlier to claim that 0xChat can compete with this. But Iām optimistic š