mat_hdr_level 0 is a startup option. It switches the game from hdr mode to ldr mode. It effectively brightens l4d2 and makes everything very texture less. It does not require sv_cheats 1. There seems to be some confusion. People are mistaking it for a cheat protected command. It is a startup option. It does not require console in any way.
being able to play new version using this addon=people using sourcemod+metamod stripper to place all items exactly(in legal spawns ofc but all adrenalines for example) where they want without being detectable unless they submit multiple runs with the exact same item spawns. you cant use stripper on the old version.
so if some1 is doing an IL can they just do this glitch in advance and then proceed to get free time on the level they choose?