It probably lacks in one or more of the nutrients they measured: vitamin A, folate, vitamin b12 etc. (see caption). This can be fixed with organ meats even on a meat based diet. There's no other way (for a meat based diet), since nutrients aren't distributed evenly in all tissues, yet all nutrients are needed. Some tissues will have more vitamin A, eyes have more carotenoids, skin has more glycine etc.
The other option is supplements (but supplements won't fix the other issues u/factdigger mentioned like "dysbiosis, bloat, leaky gut, lipopolysaccharide poisoning, immune aggrevation and general health issues" that certain foods can cause in some people).
The third option is to eat plant sources of the required nutrients..