High LDL can occur for a number of reasons unrelated to impending cardiovascular disease. People on low-carb or ketogenic eating plans typically have a lot more fat moving through their bodies because their bodies are burning fat, not carbohydrates, for the bulk of their energy needs. So, naturally, their LDL cholesterol measurement will be higher. In fact, it is fairly standard advice for people actively losing weight on LC/keto diets to wait until their weight has stabilized before reacting strongly to LDL levels that are considered "high" according to the typical standard of care (LDL of 100 or higher).
I think the point being missed here is that the LDL number by itself is a poor measure of adverse potential cardiac outcomes. Medical science does not know fully why LDL levels increase. Several studies (not paid for by The National Egg Yolk Council ) now show that LDL levels are not tied to the amount of saturated fats or high-cholesterol foods people eat. There are studies showing that temporary high levels of blood glucose (even postprandial levels in people otherwise without issues like diabetes, metabolic syndrome, PCOS, etc.) seem to correlate with increased incidence of cardiovascular disease. And then there's the conundrum of why cardiovascular disease and high blood pressure and the like are on the rise despite the virtual eradication of trans fats and the continued presence of 100-calorie packets of carbohydrates -- maybe there's a causality but it sure doesn't look like fats are the bad guys there.
Properly assessing the risk of heart disease, atherosclerosis, etc., requires looking at HDL levels and triglyceride levels at a minimum. In fact, current studies show that the ratio between LDL and triglycerides is a very good indicator of future cardiac problems -- much better than reacting to LDL levels alone. I believe that's why so many of us are advising caution in following medical advice that seems to be applied to blocks of people meeting very broad criteria (over 50 or with high blood pressure or with LDL levels above 100 or whatever). It seems unlikely that one factor is affecting the health of so many people so why key on that as a response?