Taubes typically cites all his sources. YOu may need to get a copy of the book and find where in the book it says that in order to track down his citation. Anyway, Taubes is not infallible. Some of what he said will later turn out to be wrong, although I think his basic ideas overall will turn out to be reasonably accurate. I read your links above and in one of them it mentions that de novo lipogenesis rates are greatly increased in situations in which carb calories greatly exceed daily energy requirements and the person is gaining weight quickly (that was the second link), so it might be a case where this is more prevalent in those gaining weight. Also, some of this is a bit hard for me to understand, not being a bio major and all. But seems to me that it's unlikely that a large bunch of fat is both created and stored when we eat carbs. If that were to happen, then we would get fat very very quickly, not gradually. And there will be other factors. If the diet is already high in fat, then more fat may be less likely to be created. If the diet is low in carbs, much of a carb meal may go to glycogen replenishment instead of fat.
Of course, Taubes may have overstated the case and the carb prob may in fact turn out to be more of an issue of it supressing fat removal instead of creation of new fat. PLus, it only takes a tiny tip towards a tiny bit more fat stored each day to yield pounds and pounds gained year after year. I suspect whatever is discovered, it's really going to be just a subtle shift, a tiny imbalance for most of us, that results in a few more pounds every year, stubborn pounds that don't want to get lost, until slowly the metabolism gets more and more unbalanced.
If the body is making lots of fat from carbs, then it might also be using some of that fat right away and so not storing it? Not being a bio major, the science on some of these articles is a bit hard for me to follow. I don't think I am totally understanding what exactly they are measuring. In one, it seemed like they were only measuring stored fat that came from de novo lipogenesis. In another, it seemed they were only measuring hepatic fat generation but not de novo lipogenesis from other sources (like maybe fat cells) The third link froze my computer so I didn't read it.