Well, I initially ran the test on my cheap vivo phone when I switched to my Motorola the difference was very noticeable, there's obvious color crushing/reduced visible color gamut on the vivo, they're like chalk and cheese when compared side by side.

BTW, I used to calibrate color grading equipment for the film processing industry and the controls were strict, 18% gray walls, D65 calibration sources, densitometric equipment, Ishihara tests for me, etc. so I'm well aware of the issues.