There’s no such thing as a hdmi 2.0 cable, nor one that is certified for Dolby Vision. The cables I have work with HDR and Dolby Vision just fine, but as another poster pointed out, my TV doesn’t support 60hz Dolby Vision
Your information is wrong.
2.0 for 4K
With the TV industry moving inexorably toward Ultra HD "4K," it was clear there needed to be more bandwidth in the connection to handle the future's higher resolutions and frame rates. On that front, HDMI 2.0 delivers, supporting "4K" (2160p by the Forum's explanation) up to 60fps. This allows for full-resolution 4K 3D, along with higher-frame-rate 2D content, like (potentially) home videos and computer games (PC, not PS4/Xbox One). Since almost all movies are shot at 24fps, this increase is less important for feature films or scripted TV shows.