That study says that the risk factor is red meat consumption, not seed oils:
> The typical American and Northern European diet is high in omega-6 FAs, with the average person having an omega-6 to omega-3 FA intake ratio between 15:1 and 18:1. These populations tend to overconsume red meat and underconsume unprocessed oils and cold-water fish.
You can google what foods have high omega 6:3 ratio - plant seed oils are just one culprit of many. Livestock is largely fed corn derived feed so that’s why our meat is high in omega 6 content.
So, stick to canola oil over olive oil if you want lower omega 6 ratios. Stick to unsaturated fats over sat fats.
People who fixate on omega 6 and seed oils usually dismiss the downsides of saturated fat, as a rule. They will go on about the dangers of seed oil based on something that isn’t scientific consensus, yet the overwhelming balance of evidence against saturated fat doesn’t meet their
epistemic standard.
This is dealing with a specific condition (MGD) but after the intro sections it describes how dietary omega fatty acids play into inflammation.