Why does it have to be verified? That is an Intel slide.
No proof that its a Intel slide. Intel has refused to officially share die sizes to the press. please read the below article. We will know on Monday from reviews if Intel officially revealed die size , transistor count or turbo clocks at different core counts
https://videocardz.com/72817/intel-coffelake-s-8th-gen-desktop-and-z370-controversy