In terms of privacy how does this compare to flashing lineage OS?
If you're concerned about privacy, then you don't want to install Google services or the Play Store. You'll also want to disable all Amazon Services that you can, including anything Alexa. But without flashing a new ROM like Lineage, you're stuck with some Amazon snooping. You also don't want to register the tablet with Amazon. You are able with the Toolkit to disable almost everything Amazon on the tablet, but some things might lead to it either not functioning correctly or not booting.
TLDR: For absolute privacy, Lineage is better as long as you don't install Gapps with it and do all your app shopping on open source platforms like F-Droid, and don't install any social media apps.