The link you sent goes to the "Enable Custom Fields for Reporting in Lead, Campaign, Opportunity, and Program Opportunity Analysis Areas" tutorial, which does not explain what the Access Revenue Cycle Analytics permission controls.
The help article
Descriptions of Role Permissions, lists Access Revenue Cycle Analytics as a permission under the Access Admin section, but it does not define specifically what this enables.
Does this permission enable the ability to Create, View, Edit and Delete everything in RCA including the Revenue Cycle Model? Does this permission enable the ability to do the same with the reports in the Revenue Cycle Explorer?