Using regular ONR, would do nothing (for adding protection).
He was asking to clean and "most importantly for protection" for sealed type leather surfaces. Which regular ONR would not be "helpful" for all his criteria. No need to jump to be offended on the internet, potato salad.
I figure uv protection is important. However over the years ive seen some vw leather seats hold up great and some get destroyed. Since its such a ssaled leather idk what else to chaulk it up to other than too much heat/cold or lack of uv protection. All said i do leather tratments just to restore the feel and smell lol