Me too, John. I saw that particular recipe got several rave reviews, so I decided to try it as written before I modified it. I will probably make it again with next year's harvest, but I will not add sugar. We like unsweetened dill pickle relish, so I think we're okay with an unsweetened squash relish.
I grew up in a family where added sugar was a rarity. Any sort of refined sugar other than rice syrup,
honey, or molasses is a severe migraine trigger for my mother. (She went blind in one eye, numb on one side of her body, and vomited. And the pain was excruciating. Several doctors couldn't help her, so she decided to be her own health detective.)
Thus, we generally didn't eat much sugar. I absolutely think my health is better for it!