Not true at all. Vega destroy 1080 ti even with the old beta bugged and slow drivers
http://barefeats.com/early_vega.html
Anyway Nvidia drivers for macOS are terrible and especially not stable
Well it beats it in some tests, yes, but if you actually read that test report, it also says:
The RX Vega 64 is a power hog. Anandtech reported that the Vega 64 consumed 150W more than the GTX 1080 which is considered its direct competitor. It also consumed more than the GTX 1080 Ti.
And suddenly the test you linked to seems very unimpressive overall. The RX Vega 64 is a little bit better in some tests, but at the cost of 150W more power usage than the GTX 1080. Not very nice...