They felt left out so AMD and Nvidia swapped places for the next Vulkun game = Rage 2 where the radeon 7 struggles to beat a 1080 and rtx 2060
Not sure where you getting your results from but I would stop using them they clearly false information.
Vega 64 alone is a good 20 fps ahead of the 1080 at times.
64 never drops below 60fps
See Rage 2 thread for videos.