FPS wont increase even if high poly model is behind a plane

I have very high poly mesh behind a simple unity plane. FPS drops somewhere around 10fps when the high poly object is active even if its hidden behind the plane.

> Its a new project
> Camera Occlusion culling enabled
> Dynamic Occlusion in meshes enabled

does occlusion culling only work if objects are behind the camera?

here are the stats

Inactive High Poly Model:

View attachment 1039334


Active High Poly...

FPS wont increase even if high poly model is behind a plane