It's probably that the search result for Sitemap only showed up on your SERP only due to cache and the fact you're the store owner.
I tried to search for it and it did not show up on my search result page. In fact, this page is nested inside Omitted Results - which is Search Results Google deems irrelevant and not indexable.
So I'd say that you should not worry about it.
If you want to learn more about How To Remove an URL from Search Engine, check out this article: https://ahrefs.com/blog/remove-urls-from-google/#how-to-remove-urls
Let me know if my answer is of any help with a thumb up or like.
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