The user guide actually says the PV270, SW270C, and SW321C displays are the only BenQ displays with viable 3D LUTs.
That is information from BenQ directly.
While other displays have a form of LUT capability, it is not a true 3D LUT, and so cannot be calibrated with any externally generated 3D LUT.
(For example, the LUT in the SW271 is 'compressed' so not a true 3D LUT.)
Mob Boss at Light Illusion