The LG TVs do not support Freesync. They support HDMI 2.1 VRR, and since there are no AMD HDMI 2.1 Graphics cards out there, there is no way to practically test whether the LG TVs VRR actually works with AMD GPUs (this article is confirmation that it works with Nvidia G-Sync). While theoretically an AMD GPU with Freesync should be able to use HDMI 2.1 VRR, since there is no such beast - a HDMI 2.1 AMD GPU - it's a moot point really."G-Sync Compatibility" is effectively no different than FreeSync as there is no hardware module involved. And those TVs already have FreeSync as they are HDMI 2.1. nVidia cards have of course been able to do FreeSync since the January driver.
Looks like LG finally opened their new inkjet OLED panel printing factory in China a couple weeks ago. Probably will continue to get South Korean panels in the US though, due to tariffs.