https://www.rtings.com/monitor/learn/research/vrr-flicker
Section 6.3.1 of VESA's certification explains that their flicker testing is exclusively measured on a mid-gray (RGB 127) background, and happily for OLEDs, this shade doesn't present any more challenge than it does for most IPS panels.
VESA's flicker testing is
only performed on a mid-gray background, but the
flicker we've found in our testing for OLEDs (and VAs to a similar extent) is most visible in dark scenes.
This is a major oversight, and we believe our VRR flicker testing is more comprehensive and relevant to the real-world gaming experiences these monitors will be used for.