It's a matter of accuracy, for a start - msm has been reporting that it is oil or crude oil that is coming down the pipeline to be loaded on tankers - this inaccuracy is, finally, fading with the correct reportage (as in the posted Canadian Press story) that the product is - diluted bitumen. We know little or nothing about the effect of it if there is a marine environment spill -- https://www.desmog.ca/2016/12/09/review-9-000-studies-finds-we-know-squat-about-bitumen-spills-ocean-environments