It's related to that, RTX Mega Geometry refers to a new (currently Nvidia-only) set of driver APIs which enable Nanite-like geometry streaming for raytracing acceleration structures. This library could be used to generate the data to feed those APIs. There's a link to another repo demonstrating how to render this data using either rasterization via mesh shaders, or raytracing via their Mega Geometry extension.

https://github.com/nvpro-samples/vk_lod_clusters

I expect something along the lines of Mega Geometry will be standardized in DirectX and Vulkan eventually, but that takes time.