As I see, it tries to explain.

But as someone who's not a network specialist, I fail to see how this is not a glorified P2P DNS.

Maybe this example helps:

https://github.com/n0-computer/iroh#rust-library

    const ALPN: &[u8] = b"iroh-example/echo/0";

    let endpoint = Endpoint::bind().await?;

    // Open a connection to the accepting endpoint
    let conn = endpoint.connect(addr, ALPN).await?;

    // Open a bidirectional QUIC stream
    let (mut send, mut recv) = conn.open_bi().await?;

    // Send some data to be echoed
    send.write_all(b"Hello, world!").await?;
    send.finish()?;

    // Receive the echo
    let response = recv.read_to_end(1000).await?;
    assert_eq!(&response, b"Hello, world!");

    // As the side receiving the last application data - say goodbye
    conn.close(0u32.into(), b"bye!");

    // Close the endpoint and all its connections
    endpoint.close().await;