The changes in the Kindle app date from January 2023 - you needed the most recent Kindle app to download your book if it was published on or after ~7th Jan 2023. Books published before that date are still downloadable and should still be convertable.
It's why I now purchase from Kobo: downloads in epub format, and DRM (if applicable) is Adobe. I can price match with Amazon provided it's the same edition (generally matching cover & publication date are fine as Amazon no longer records the ISBN).
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