[RSS Feed/News] Any performance advantages of loading external javascript this way?

[XenForo]

So uhm, while browsing some add-ons I installed, I found this code in one of its templates:

<xf:js>
<script async defer
src="https://example.com/script.js">
</script>
</xf:js>
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I thought it was wrong at first, as I couldn't find any documentation related to it. All these years, if I had an external javascript file to include, I just used to do:

<script async defer src="https://example.com/script.js">
</script>
Click to expand...

Or

...
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