Yeah, it’s advertised as 160hz and even amdgpu_top (which uses xrandr or something like it) says 159.96hz is the first preferred mode, the second being 100hz
I had this problem before with a Nvidia card which reset to 144hz after an update and I could never enable it again. However it’s a mystery as to why it boots up at 160hz in systemd-boot console, and goes back to 144hz when entering KDE or turning the display off