1100 euros, I don’t think so, not for my self imposed budget.Then he would lose HDR because it is 1.2 .
NVIDIA does not support FreeSync through HDMI 2.0 (AMD proprietary).
Time to try to return the monitor.
Or maybe one can use 2 cables and have each feature always activated on "each display".
Then DisplayPort for FreeSync and 10-bit SDR.
HDMI 2.0 for 4K 60Hz 4:2:2 HDR.
But one would still miss 4K 60Hz 4:4:4 HDR which needs DP 1.4 .
1100 euro to add adaptive sync to HDR with NVIDIA.