Those charts, regardless of their autheticity and accuracy, do make one thing apparent. While decent at 4k, it does seem as though the 4k performance is relatively less consistent against previous gen AMD GPUs. And to me it looks like it's the lower 16GB of VRAM that seems to be holding the 9070(XT) back, when compared to previous gen.
It's still nice performance if real, but it would have been nice for AMD to put a bit more VRAM on these, to help them handle future 4k titles. Almost feels like they're taking a page from Nvidia's book, by not increasing VRAM capacity from last gen (when comparing 9070xt to 7800xt).