They are ignoring the problem of how do you know the other person's public key. And you don't. That's why people post their public keys on their own websites or

They are ignoring the problem of how do you know the other person's public key. And you don't. That's why people post their public keys on their own websites or on X or whatever - basically, a third-party THEY trust and believe you can trust as well, so yeah, this doesn't remove trust on a third-party as that's impossible.