Can't read the paper from home, but if this article is even remotely closely reporting the findings of the paper, it would be an interesting finding, especially "revealed that participants with higher blood triglyceride levels seemed to benefit more from the healthy meals. Their arteries responded better to the Mediterranean meal compared to people with low triglyceride levels." Triglyceride levels are almost always an indicator of not fat consumption but of high calorie diets. Taken together, this would suggest that under any sort of high calorie environment, saturated fats become dangerous to heart health, whereas if you're under it you are ok (as a caveat, some saturated fats like stearic acid are crucial to heart health, and other saturated fats are important for proper hormone homeostasis).
Another thing this would imply is that you should NOT bulk using keto if your health is important to you. Otherwise, you risk incurring heart health problems over the long run unless you regulate your saturated fat consumption as well.
Take home message: everything in moderation.