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Cool, unfortunately as this isn’t a blog but more a collection of articles there’s no RSS feed to keep track

Looks like he stopped updating it in 2013, actually. Shame.

As mentioned below, he has a blog at https://www.iquilezles.org/blog/ and it's WordPress, so there's a feed at https://www.iquilezles.org/blog/wp-rss2.php .