I asked around and found out it's because the Team Calendars Server license works with Data Center. You just have to make sure Team Calendars is licensed on a user tier that is equal to or higher than your Data Center license as in:
The article you reference only demonstrates that Team Calendar licenses must match the Confluence licenses.
I'm asking why the purchasing of Confluence for Data Center does not list Team Calendar?
When I go to the pricing for Conflucent on JIRA Server edition, it's lists Team Calendar as an add-on. It does not list it as an add on when selecting the Data Center edition of Confluence.
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