OT. I woulnd’t bother investigating. My own testing with the same method using OpenLightMaster website with my S21D below. Note Ra 83 and R9 54 with Nichia 219b 4500k. 
This website is done by 3rd party and completely unreliable IME. Note number 3 and especially 4. Besides the problem with Ra and R9 being wrong, when sensor is overloaded because light is too bright or too close, such as when tested with bright throwers for example, it goes completely bonkers with results, as in crazy results, WITHOUT warning you like the official Opple Lightmaster App would.
I have not completed testing with low CRI lights yet. Lost interest after S21D 219b and 519a. It wouldn’t surprise me if more weird results appear.