If that Retul video shows a position with 80.3cm of seat height, then an 83cm seat height (Guru #'s) is not a good outcome. You are close to the high end of an acceptable range of knee extension in the video (and showing some toe down at the bottom). The overall Retul video looks decent, though you could probably ride lower and more forward.

The Guru numbers are somewhat eh, questionable. Not just the seat height, but those pad x,y numbers are nearly outside the adjustment range of a 58cm IA, which is a good fitting bike with a nice range. With an 80cm seat height on a reasonable lean athlete, there's little reason you shouldn't fit that bike a little better. With the Guru numbers you are going to be 1mm shy on drop (644 actual vs 645 lowest bike setting) and a mere 8mm away from fully adjusted outwards in reach (557 actual vs 565 longest bike setting)

Your Retul fit of, let's call it, 520 to center of pads (if we bring you forwards slightly as well) and 680, if we drop you another 2.5cm, is really close to centered in that 58cm IA. I think an even 80cm of seat heigty with 3cm of setback and maybe 10 cm of drop would be close to an actual optimized fit. Call it pad x,y of 520, 680.

Forgive me if I interpreted anything wrong.