The Kindle already knows which books you have in the cloud, and downloads that list in order to track the contents of the Cloud tab.
This is why when you try to delete a book with an ASIN that matches your Kindle Cloud, it says "Remove from Device", and when it is a sideloaded book with no ASIN (or an auto-generated UUID one) it says "Delete This Book".
This happens regardless of your current connectivity status.
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