thank you for sharing your experience with the Short tool jig SVS-32. This jig offers larger number of degrees of freedom what is however compensated by the fact that some part of the tool control is transferred to the sharpener.
The sentence you have quoted is recollection of my thoughts concerning general requirements on the blade geometry which have to be fulfilled when trying to get a square edge. No jig can help us to get square edge when the geometrical prerequisites are not met. Since I have recognized it, I keep calmer even after several vain attempts to grind a square edge.