Yeah, I'm aware of that, but my point wasn't regarding minimum operational range, despite the linked threads original purpose. It's with reference to operation of freesync within the FULL range of the monitor, and that depends on the monitor's scalar, not freesyncs capabilities (of which is 9 - 244hz). The MG279Q is a 144hz monitor, but it's official Freesync range is 35 - 90 hz. Later on in the thread I linked, someone used the software to achieve freesync @ 60 hz - 144hz, and I've heard another report that someone did 56 - 144hz, which is what Eizo is claiming with their upcoming monitor as one of two toggles.
What isn't possible is 35 - 144hz on the MG279Q, or the Eizo apparently, which probably uses the same AUO panel. What is needed is panels that can support freesync in the full range of the monitor up to it's max value.