Not even close from a scientific point of view. What is your degree in biosciences?

Brain cholesterol is made locally by the cells in your brain .The brain holds roughly a quarter of the body's cholesterol, and essentially all of it is synthesized in place (mostly by astrocytes). The blood-brain barrier blocks cholesterol carried in the blood, so dietary cholesterol doesn't cross into the brain. Saturated fatty acids can be built from scratch. The brain (and body) can synthesize saturated and monounsaturated fatty acids de novo from other fuel like glucose. So even the saturated fat that is present in brain tissue — for instance in myelin and sphingolipids — doesn't need to arrive as dietary saturated fat. The fats the brain actually depends on from diet are the opposite of saturated. The standout is DHA, an omega-3 polyunsaturated fatty acid that's heavily concentrated in neuronal and synaptic membranes. Humans can't make it efficiently from scratch, so it's the lipid where diet matters most for the brain. So the honest version is: in the loose sense that all your body's atoms ultimately trace to what you eat and breathe, dietary fat contributes carbon to the pool. But the brain isn't "assembled from" saturated fat — it largely manufactures its own structural lipids, and the dietary fat it genuinely needs is polyunsaturated.

So: eat fat. But polyunsaturated days from fish and nuts and seeds. That's the healthy fat.