Looks like their website is built with Hugo[1], and Hugo automatically generates RSS. So you can grab it manually if they don't provide a link for it by appending index.xml in the section URL.
I now see it on the blog root but it would be great if the actual article was also marked up with the RSS feed. This is pretty standard and I only bothered looking at the blog homepage because the writing was really good :)
Here's the one for the blog: https://asahilinux.org/blog/index.xml
Might be nice if we have an actual link to the RSS somewhere in the blog though.
[1] https://github.com/AsahiLinux/AsahiLinux.github.io