It seems to be a tool that intercepts D3D calls and translates them into a Vulkan layer, sort of like DXVK (edit: I just saw that it literally uses DXVK, which

It seems to be a tool that intercepts D3D calls and translates them into a Vulkan layer, sort of like DXVK (edit: I just saw that it literally uses DXVK, which makes sense), including intercepting the actual resources being uploaded to the GPU. So probably the user of this tool can intercept mesh data being uploaded and say "replace it with this mesh" which has completely different geometry. Also nothing about this tool screams "automatic", it definitely seems to be something that serves as a modding tool rather than an "RTX ON" toggle.