If you can someone to certify (as in “give a hecksher”) that the oil, kernels, and additives are kosher, and the utensils have been kashered since the last time they were used for treff — then of course it is kosher. You’ll see a nice big hecksher sign.
Otherwise, assume they’ve used oil and additives dervied for non-kosher sources, e.g. pig fat.