My reading of the testing is that feeding not much more palm oil (contains 44% palmitic acid) increased palmitic acids in milk fat from 30% to 40%.If the cattle are ingesting and digesting palm oil, then palm oil is not coming out in the milk fat.
My experience with feeding our goats, chickens is that there is a large difference in fat and egg color and flavor depending on what they eat. Grass vs grain is obvious.
Especially for animals bred for high growth rates or production, I think the change the composition of fats and proteins that they eat, is very little as this makes them more efficient, and the main metric in meat or dairy is production volume or weight, not a healthy fat profile. Also none of them will live a long natural life. The animals are often eating the agricultural feed version of McDonalds, and they don't see middle-age when that diet catches up with them!