DllNotFoundException: UnityMockHMD after building an xr sdk upgraded project using the Mock HMD XR SDK

1. I was trying to regress a bug with the Mock HMD with a project that has been updated from 2019.2 and legacy XR using the mock as well.
When building the mock hmd fails to get built or something and I get the DllNotFoundException: UnityMockHMD error and it fails.
However, I noticed it was seemingly still rendering in stereo and that seems to be because the built in xr stuff is still enabled. I never got the warning for disabling built in xr either when I installed the mock xr sdk.
This is confusing of course but maybe that state is related to the issue? I manually disabled this in the project settings by setting the
m_BuildTargetVRSettings:, m_Enabled to 0 but it still fails to find that dll in the built player and then just renders in monoscopic.