caboy You have observed the moiree effect: https://en.wikipedia.org/wiki/Moir%C3%A9_pattern
This picture is what you have seen: https://en.wikipedia.org/wiki/Moir%C3%A9_pattern#/media/File:Moir%C3%A9_pattern.png
Notebookcheck uses magnification, slow motion, and a steady camera setup to reveal temporal dithering (a strong variant in this case). You did not magnify, did not use slow motion, and you moved your hand a lot. This is not adequate for detecting temporal dithering.
When using the control panel's switch, it may be difficult to consciously notice the differences. You are more likely to see changes on solid dark gray colors, and if you change the setting with your keyboard back and forth. You may also see a slight change in gradients. The changes may be more visible if you set the color depth to 6 bit instead of 8. In my experience they are most visible when using 6 bit depth and static dithering.