Nah big navi does not compete with this. It's Vega based Arcturus.
At least there's someone else who understands this.
Volta is really quite different than the Turing cores.
Vega V20 fights directly with Volta and provides some a lot of competition.
Navi is the compute crippled GeForce/Quadro fighter.
This is the big reason that the APUs use Vega based GFX because for office stuff OpenCL performance is king. V20 also has the same degenerated rendering hardware as Navi. So it can do GFX like Navi but crushes it in compute tasks.
A simple comparison...
Xbox One/S and the PS4 variants use Polaris GPUs and they are in the Fury/Navi line.
The Xbox One X uses a GPU based off of the 290X/Vega branch.
Radeon VII isn't much faster in gaming than a 5700XT, but it's 5.5 times faster in compute. The 5700XT has basically the same compute performance as a 2080Ti.
Edit: I really hope Arcturus brings it, because the sooner CUDA dies out the better. Locking so much important research to a closed system isn't good. OpenCL ftw!