hi there! Yes, this uses Oculus Integration. The Grabbing / Grabbable mechanic is a custom solution, but the Oculus SDK is used for things like playspace tracking, camera movement, hand tracking and things like that. I've tested this on Unity 2018 and 2019 and all works fine there.
The only thing you may need to do is upgrade the included the materials if you're using the LWRP . Otherwise some of the textures will be bright pink.