The Vega 20 GPU is a 7nm part that will be used for the Radeon Instinct machine learning card. At the moment, there's no indication AMD plans to launch a consumer lineup based on this GPU. The benchmark entry reveals the Vega 20 card features 32GB HBM2 memory and that the card has a device ID of 66A0.
The clock speeds were obviously read incorrectly, but the same issue could be observed for Vega 10 before it was released (so yes, it does not mean it was running at 1000 MHz). The Vega 20 testing platform features Ryzen 7 1700.Anyway, VideoCardz compared the scores with an entry of the Vega Frontier Edition and it doesn't look like the 7nm Vega is much faster. This could be because it's an early engineering sample, or it could be representative of the final product (as we saw with the early Vega 10 scores).