All this information should be included too! Obviously there is a limit to the article scope but it wouldn’t harm to answer these obvious questions it leaves dangling.

No, fats that come from the food (triglycerides) are directly consumable by the cells.

That can't be right. Triglycerides are the bulk of body fat. Now, presumably if you eat fatty tissue the triglycerides in the food will be broken down by enzymes into simpler molecules that can be absorbed by the intestinal walls, and perhaps those molecules may be directly usable. Is that what you mean? If so, then do you know what triglycerides break down into?