there should be more lag with the Saturn. If there isn’t, please let me know right away
I did this, and indeed there is more delay for the saturn. 8ms for the SNES and 25ms for the saturn.
I also tested some of the other systems listed in your article https://www.videogameperfection.com/2014/09/24/curious-dvdo-edge/
Nintendo 64 NTSC
I only got 6ms for my N64
And 8ms for my PCE DUO-R