Hello Rogier,
Yes, that is correct. Location in PureCloud directory is not a string field so cannot be populated by a mapping from AD. However, you can create a custom field in PureCloud and map from AD to this field. Config would be as follows:
{
"direction": "ex2in",
"internal": "<customfield.customvalue>",
"external": "User.Company"
},
Any user with "Admin" permissions can add a custom field in PureCloud. Do this by browsing to Admin/Directory/Profile Fields then Add Section.