Gotta protect those precious greasy canola seed dollars, right? Seriously, does anyone even believe this?? I'm guessing High Fructose Corn Syrup doesn't cause diabetes either... As soon as some health investigator has a look at one of their profitable products, a squad of "scientists" rush to the scene to officially deboink the myth that it gives you heart disease. What a joke. And a sad one at that.
The specific claim being debunked is that seed oils are particularly bad ("toxic") for you compared to other oils. Which is not supported by evidence.
As you note, there's plenty of evidence that a high fat diet causes assorted health issues. Seed oils specifically are not a disproportionately strong culprit.