No, refresh rate directly affects latency. At a refresh rate of 60Hz (without gsync/freesync), with input arriving at arbitrary times, you have an average of ha

No, refresh rate directly affects latency. At a refresh rate of 60Hz (without gsync/freesync), with input arriving at arbitrary times, you have an average of half a frame (and a maximum of a whole frame) of unavoidable latency, above and beyond whatever other latency may exist. If you have enough control over your devices, you can arrange for your input to arrive at just the right time to be included in each frame without extra latency, though. The kind of latency you describe is that internal to the display; it could be called the video-signal-to-photon latency. The parent you're replying to is explaining the action-to-video-signal and compute-to-video-signal latency, and its effects on the action-to-photon latency.