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;

Such is life when you choose to be introduced to something by a version update blogpost, instead of clicking in the top-left corner and reading the landing page.

This is true. But you could click the name in the top left. Or Docs.

IP addresses break, dial keys instead

Modular networking stack for direct, peer-to-peer connections between devices

iroh establishes direct connections whenever possible, falling back to relay servers if necessary. Get fast, efficient, reliable connections that are authenticated and encrypted end-to-end using QUIC.