You're reading the chart wrong.
The original 2080 review from TPU shows the 1080 Ti is (92 - 100)/100 = 8% slower.
The 2060 Super review shows the 1080 Ti is (113 - 122)/122 = 7.4% slower.
Think of it in terms of FPS. If we converted the 100% of the 2060 Super to, say 70 FPS:
You can do the above calculation with literally any base number for the 2060 Super and come up with the same 7.4%, technically meaning the 1080 Ti got faster compared to the 2080 over time at 1440p.
- 1080 Ti = 113% of a 2060 Super = 70 * 1.13 = 79.1 FPS
- 2080 = 122% of a 2060 Super = 70 * 1.22 = 85.4 FPS
- (79.1 - 85.4)/85.4 = -7.4% (-0.0737704918)
Somebody here knows the difference between percentage and percentage points. its amazing how many fails this middle school topic and thinks that 140% is 10% more than 130%