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After more than 13 years, and tens of thousands of questions, Moz Q&A closed on 12th December 2024. Whilst we’re not completely removing the content - many posts will still be possible to view - we have locked both new posts and new replies. More details here.
There's one rule in SEO, Yoast is always right 
(not only because he's Dutch). But in this case he's right. By mentioning the KML file to Google it knows where it could be found. So it will trigger a visit to the file which get generated on the fly + by doing this it prevents you from being indexed.