The information on the website is definitely outdated. BTW, I'd strongly recommend using
Sigil to create your Kindle books, because it offers several features that are very useful for creating Kindle books:
- Automatic HTML TOC generation from NCX TOC
- Easy <guide> item definition (Cover, Start Reading Location, TOC) etc.
- Easy-to-use metadata editor
- Integrated validator etc.
(
Kindle Previewer accepts ePub files as input files and KDP in turn will of course accept MOBI files generated from ePub files.)