yes you are correct, i didn't know this before i posted. I actually swapped from 9060 XT to rtx 5070 for DLSS because I can't stand FXAA, and FSR 3/2 on top of me having some stutter when skills happen for first time eg. vindicta's assassinate.
According to DLSS swapper (a modding tool to force or swap upscaling versions or their dll's), Deadlock is actually using FSR 3.1 (on Vulkan) which is the only requirement for driver-software level upgrade to become fsr 4 alongside having a 9000 series gpu. So hoping it should be possible and...