It's true, unless you use unrealistic settings for the most part there is barely any difference between all the high end CPUs when paired with a high end GPU at 1440P and above using the higher quality settings. Be wary of anyone here who says otherwise.
Those results you linked show a 0.6% performance difference in Cyberpunk with a 4090 when using a 5800X3D and a 13900K at 1080P and 4K. As they used a 4090, they would have likely used maximum settings (maybe not with RT though as it doesn't specify) and according to the bench notes, they used 'custom' test scenes and not built in benchmarks.
Who knows what area they test, they never reveal which scenes they test. That's one thing I wish there was more transparency on if the viewer can copy the test scene to measure their own hardware's performance.