Datapoint Trinidadian Creole/Relativizer that or what in non-restrictive contexts

Variety: Trinidadian Creole
Feature: Relativizer that or what in non-restrictive contexts
Value: B - feature is neither pervasive nor extremely rare
Informants: Dagmar Deuber and Valerie Youssef

Examples

Example 2727:
My brother, that has/have a PhD, has just landed a new job