Depends on the context. If you're already far gone and got insulin resistance and/or damaged insides, the starch bomb+fat will not help matters.
But homemade fries will still grant a lot of the vitamins in the potatoes and "fat" used. Like if you use grass-fed butter for the frying, the fat soluble vitamins would be present.
I have teeth concerns, so I'd avoid the fries due to the starch content, not the fat content. Or if I do eat them, many would consider me bizarre if I cut them up further with knife and fork before swallowing whole.
If anything, eating fatty has not harmed me in the slightest. My triglyceride/HDL ratio has improved from 1.7 down two years ago to 1.2 this year. But I only eat micronutrient-nutritious, non-inflammatory fatty foods like pasture-raised eggs, grass-fed butter, fatty fish, the occasional 73% lean/27% fat ground beef.