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"The book descriptions have a note "This title is not supported on Kindle E-readers."
I've encountered this with quite simple novels. It's not just print replica books.
It's a combination of Three stupidities:
1) Amazon providing tools / formats for the Fire (originally misleadingly Kindle Fire as it's a crippled Android LCD tablet), later supported by Mac / Windows.
2) Amazon selling "real ebooks" and also "digital magazines" both in Kindle Store. Greed.
3) Publishers stupidly using these instead of creating regular ebooks.
Now it could be that these text books need colour, or large images, or complex layout not possible in mobi or KF8 (any ordinary KF8 can be converted to mobi or ePub and still be readible). However I've examined some novels I bought using these enhanced "Will not work on ANY eInk ereader Kindle) and Calibre did convert to epub. The formatting was a disaster. Export as RTF worked, then I was able to reformat using LibreOffice Writer and make azw3 / mobi / epubs that worked.
I'm sure there are text books that need the enhanced formating that only works on Kindle Apps and Mac/Windows, but I'd be sure that's rare and the problem is failure of the publishers to understand the tools, workflow or even what is an ebook.
So these are not ebooks in any useful sense for real ereaders. Amazon has been REALLY stupid combining the two kinds of electronic media.
It's like PDFs are not at all ebooks. Stupidly Amazon even allows certain PDFs to be in the Kindle store. Google Books (because they like piracy, boosts ad revenue) even encourages PDF format upload, with epub as a secondary option.
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