You probably only saw the cursive backup font and not the intended Roboto font that the page actually uses (which took about half a second to load for me); here's a snippet from the CSS:

  font-family: "Roboto", "Underdog", cursive, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Helvetica, Arial, sans-serif, "Apple Color Emoji",
    "Segoe UI Emoji", "Segoe UI Symbol";