Gamut matters more than accuracy here. If the monitor is skewed blue, or has darker reds, or something like that, the test remains valid. In general, asking for

Gamut matters more than accuracy here. If the monitor is skewed blue, or has darker reds, or something like that, the test remains valid. In general, asking for more blue will lead to a bluer pixel. The exception is when a monitor is already maxed in blue, but that is about the gamut (range) of the monitor, not its accuracy.