Replied to you on reddit too, leave it alone and delete your posts. This BAD INFO went viral 6 months ago and required a dev to reply
From dev notes:
There is one exception to this and it is the setting called “rtxgi_scale”. This setting while controlling the quality of the dynamic rtxgi if
rtxgi_enabled = truewill also control the quality of the baked rtxgi if the settingbaked_ddgi = true(the setting called “Global Illumination” under advanced settings). When you set rtxgi_scale to 0 that means that the baked rtxgi will also be off. While this will give you better framerate, and might be another reason for following the guides gives you better framerate, some levels that rely highly on this baked global illumination for their looks will become excessively dark as they will lack sufficient light contribution in heavily occluded areas. This is the reason why we decided to not support turning off Global Illumination from the settings menu as it makes some levels almost unplayable due to the darkness for which we have no suitable fallback.