You still need a third party wrapper like Revive to translate the games Oculus API calls to the OpenVR API most other VR headsets use.
This change just means Oculus will no longer deliberately block such wrappers from working.
Wow, this must have been a hell of an internal fight. Glad this was the conclusion though, open platforms are the only way I can see these current solutions being useful at all. Let's just hope we don't see similar restrictions cropping up on the other side of the fence.
I believe that it doesn't let you just plug in another Headset and use it with the official Oculus store - but it becomes pretty trivial for 3rd party 'hacks' like Revive to let you launch your Oculus games on an unsupported headset, rather than needing to go through a ton of trouble to circumvent the DRM.