Unrelated to this article. But somewhat related to parts of the discussion here.
One (niche) way to overcome not being able to download books from Amazon anymore is to get ebooks from a library that supports Overdrive/libby. (Some of?) Those support downloading DRM files directly from the app, which you then can run through Adobe + Calibre. Obviously, this is contingent on book availability and your ability to get a proper library card. But works for me for 90% of the books that I need.
One (niche) way to overcome not being able to download books from Amazon anymore is to get ebooks from a library that supports Overdrive/libby. (Some of?) Those support downloading DRM files directly from the app, which you then can run through Adobe + Calibre. Obviously, this is contingent on book availability and your ability to get a proper library card. But works for me for 90% of the books that I need.