m2-res_568p mp4
(824.31 KB, 480x568 h264)

Godot_v4.4.1-stable_w... mp4
(6.81 MB, 818x580 h264)

This is VoxelGI.
It has a voxel (like minecraft but smooth) version of the world in the background, and it uses it to render the reflections. 
Unreal/Unity have voxel buffers (Distance Fields) running on the pipeline as well, but they don't use it for GI or Reflections, they use blurry shitty screen space effects instead.