Damn imagine this is true and the backlash nvidia and LG are gonna getThis might NEVER be fixed!
Im on C9 and had 2080Ti.
I got DP 1.4 to HDMI 2.1 adapter and had all the same issues you have, also lack of GSYNC.
Basically I think Ampere has no native HDMI 2.1 support [some brands like gigabyte even offer 2 HDMI 2.1 ports] so they use this chip that converts DP signal to HDMI signal.
Its cheap solution