Clarification on a general rule- Is oil derived from a potential Kitneyos item not kitneyos and suitable for Ashkenazim- as was 1950’s Boro Park custom ?
1-Corn
2-Soy
3-Sesame seed
4-Peanut
That is correct.
But even if someone wants to be Machmir on that, you seldom eat something with 50% or more of these oils. Usually it will be batel berov.