sv_client_min_interp_ratio -1
cl_interp_Ratio -1
cl_interp 0
in that order, has to be done while in spectate and if you switch classes itll change back to 15.2 ms so if you want to record a demo with 0 lerp you have to go to spectator, start recording, put in the 3 commands, then join a team (if youre recording a POV demo that is, which you should be)