I believe you have to use an opamp between the reference and the pin. This is working for me.
But I don't have (or don't seem to have) access to the VREF pin from the pin assignment window. There also isn't a component VREF in the Top Design schematic.
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By setting the SAR ADC's reference voltage to 'Internal 1.024 voltas, bypassed', you can get the 1.024V on the VREF pin.
In CYBLE-014008, pin 26 is the VREF pin. Connect a 1uF cap on this pin and you will be able to measure the VREF voltage.
For some PSoC 4 devices, the VREF pin is coupled with P1.7 and there is no dedicated VREF pin. For those devices, you need to follow the guide referenced by you. For PSoC 4 BLE devices, there is a dedicated VREF pin and you don't have to do any of those configurations.