Fat distribution, including subcutaneous vs visceral, has very clear racial/ethnic genetic associations, not to mention sex. East Asian and especially South Asian groups skew much more toward visceral fat, while European and especially African groups toward subcutaneous fat. Beyond calories in/calories out, generalized advice in this context might not be as helpful on an individual basis as with other health matters. In the context of diet & weight things are already complicated, but at least in this area we know why and can more easily predict how one person's body is likely to respond vs another. (Though, it might just come down to some ethnic groups having to put in alot more effort--e.g. much greater reduction in overall weight--than others for the same reduction in visceral fat.)
Visceral fat has long-term memory, and also come as the last in the line. So the diet mentioned in the study may not have started the visceral fat reduction at all…
And I forgot, you have to exercise, HIIT, calories deficit is not enough.
Forget about Ozempic and other drugs, they are good for people with diabetes. And you have to use them for the rest of life, otherwise there is yoyo effect.
speaking of visceral fat, do you happen to have pointers how to reduce that?