the only actual study i could find in all the irrelevant links they provide is this one
which establishes a link of cancer to highly proccesed food, not specifically seed oils.

The BMJ
Association of ultra-processed food consumption with colorectal cancer risk among men and women: results from three prospective US cohort studies
Objective To examine the association between consumption of ultra-processed foods and risk of colorectal cancer among men and women from three larg...