The link between dietary cholesterol and blood cholesterol is much weaker than previously hypothesized, that's true, but there's ample evidence of the superiority of a vegetable rich diet.
The medical and scientific consensus is still that diets high in saturated fats - especially animal fats - as well as trans fats increase your risk of heart disease and high cholesterol. Other lifestyle risk factors are obesity, lack of exercise, smoking and diabetes.
Not many people can afford the grocery bill of an all dairy/beef diet. Everybody I've ever met who does keto consumes more vegetable fiber than the average american many times over, because without grain as a filler and a wallet deep enough to gorge yourself on beef and cheese all day long, fibrous vegetables are the obvious solution.
There has never been any reliable study or controlled experiment indicating that dietary cholesterol or saturated fat are the causes of anything negative. Sugar and refined grains have a MUCH higher correlation (higher than even early smoking studies). High fructose intake in particular has been a leading issue.
Is saturated fat bad for you? A diet rich in saturated fats can drive up total cholesterol, and tip the balance toward more harmful LDL cholesterol, which prompts blockages to form in arteries in the heart and elsewhere in the body. For that reason, most nutrition experts recommend limiting saturated fat to under 10% of calories a day.
A handful of recent reports have muddied the link between saturated fat and heart disease. One meta-analysis of 21 studies said that there was not enough evidence to conclude that saturated fat increases the risk of heart disease, but that replacing saturated fat with polyunsaturated fat may indeed reduce risk of heart disease.
Two other major studies narrowed the prescription slightly, concluding that replacing saturated fat with polyunsaturated fats like vegetable oils or high-fiber carbohydrates is the best bet for reducing the risk of heart disease, but replacing saturated fat with highly processed carbohydrates could do the opposite.
Why would refined oils from sources that wouldn't have been available to man for 99.9% of human and pre-human existence be recommended at all? This article does nothing but repeat most of the same tropes as espoused for the past half century with no real supporting data behind it.
Edit:
from: https://academic.oup.com/ajcn/article/80/3/550/4690530
> A causal relation between total and LDL cholesterol in blood and CAD has long been accepted. However, despite the strength of the relation between circulating concentrations of LDL cholesterol and heart disease, one should not assume that the relation between saturated fatty acid intake and heart disease is equally strong.
...
> Considerable evidence indicates that dietary saturated fats support the enhancement of HDL metabolism. In a study of the effects of reduced dietary intakes of total and saturated fat on HDL subpopulations in a group of multiracial, young and elderly men and women, subjects consumed each of the following 3 diets for 8 wk: an average American diet (34.3% of energy from total fat and 15.0% of energy from saturated fat), the American Heart Association Step I diet (28.6% of energy from total fat and 9.0% of energy from saturated fat), and a diet low in saturated fat (25.3% of energy from total fat and 6.1% of energy from saturated fat) (25). HDL2-cholesterol concentrations decreased in a stepwise fashion after the reduction of total and saturated fat. A reduction in dietary total and saturated fat decreased both large (HDL2 and HDL2b) and small, dense HDL subpopulations, although the decreases in HDL2 and HDL2b were most pronounced. Serum triacylglycerol concentrations were negatively correlated with changes in HDL2 and HDL2b cholesterol.
from: https://academic.oup.com/ajcn/article-abstract/109/2/433/528...
> Those on a low-carbohydrate weight-loss diet who increase their percentage intake of dietary saturated fat may improve their overall lipid profile provided they focus on a high-quality diet and lower their intakes of both calories and refined carbohydrates. This trial was registered at clinicaltrials.gov as NCT01826591.
They weren't replaced with vegetables, they were replaced with sugar made from cheap overproduced corn, and hydrogenated oils. Neither of those is a vegetable.
We wouldn't have nearly the diabetes problems we have now if they were replaced by more fresh vegetables.
For the most part vegetable intake is fine. Though excess fruit consumption year round, and in particular juice is pretty much inline with straight sugar. Your pancreas and liver don't care that it's "natural sugar" a term which irks me to no end.