Does anyone know if the new HL2 RTX Remix will work with the existing VR mod?
No one knows… Tho I guess you could ask someone that has RTX Remix to make a test.
I doubt any modern hardware will be able to run HL2 with path tracing at the latencies and consistent framerates required by VR.
The simple answer is NO. The developer confirmed in a Steam discussion on the HL2-VR page that it won’t be compatible.