For an explanation of Google Fonts loading techniques, read The Fastest Google Fonts by CSS Wizardry. The example below illustrates the linked resource’s approach.
<link rel="preconnect"
href="https://fonts.gstatic.com"
crossorigin />
<!-- [2] -->
<link rel="preload"
as="style"
href="$CSS&display=swap" />
<!-- [3] -->
<link rel="stylesheet"
href="$CSS&display=swap"
media="print" onload="this.media='all'" />
<!-- [4] -->
<noscript>
<link rel="stylesheet"
href="$CSS&display=swap" />
</noscript>