That advice is very, very, outdated. Kindles have been locked down to only Audible for over a decade. The last stock Kindle to play user-loaded audio was the Touch from back in 2011. If you jailbreak then there are options, but I'm not aware if they work on Kindles that are BlueTooth only for audio. Do some searching for "kindle audiobook sideload" and you'll find all sorts of threads on all sorts of places and none of them have a modern solution. Don't confuse threads about Amazon Fire tablets as having any applicability for an eink Kindle like your Paperwhite.
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