The text in question is this: This installer can guide you through partitioning a disk for use by Debian, or if you prefer, you can do it manually. If you do choose to use the guided partitioning tool, you will still have a chance later to see the results, customise it, and even undo the partitioning if you do not like it.
Even though the choice for using LVM does say "Erase entire disk and use LVM" it's easy to see how this would be confusing. I think the best thing would be for partman-auto-lvm to display the partman-lvm/confirm message before touching the disk here. -- see shy jo
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