It's indeed outdated, the D4..D7 introduction line already hints on being "old".
Afaik Delphi enabled function (not method, that was earlier) in D2006, but requires "overload;" directives (I'm not sure if FPC enforces that too). Probably overloading was simple enabled in Delphi mode when compatibility moved on, and the documentation guy didn't get the message.
Then it falls onto the users, please file a documentation bug to have it updated.