Per the licensing guide
PRODUCT OFFERING METER LICENSING DEFINITION
Storage Management Per User Total number of current (active) Users to be archived (typically all Standard/Advanced/Enterprise employees in company). We do not require a license for inactive
Editions mailboxes, system/group mailboxes or Users with multiple mailboxes
So basically all 3 posters are correct. There is no link to the archive or use of it as far as the licensing goes. You could assign rights to the archive to another enabled user and add more content if you wanted without requiring a license.