I dunno, he basically says plant fiber is indigestible. I'm not sure about the oils, I think he ascribes some positive things to oilive oil in certain circumstances. Its probably a digestive aid, with the fermented properties being basically the same thing. That or he just thinks it tastes like crap and therefore will prevent people from eating much salad. 
I also tend to use ACV if I am having plant foods, same with sauerkraut and dulse, but I don't think those are recommended under Primal. I just like to cover my bases if I'm already eating a 'meal' of plants or cooked meats or vegetables or avocado or something.
The only plant oil I consume now is flax oil for the omega-3 boost and it tastes good with minced veggie salads, I no longer consume any olive oil because there is no point for me, animal fat is better. ACV is awesome to eat with veggies, I eat a big salad of minced roots, radishes and cabbage with ACV almost daily and never get any diarrhea from it, I also noticed I am never pooping out pieces of vegetables anymore, which is good because maybe the ACV help me assimilate them. Yes they are definitely full of fiber, some RAFers don't like the fiber but a find a little is actually good, I am not too keen on juicing veggies, I get a sugar rush or slight nausea after juicing them, but from the ACV salad I feel good and content, so I assume the fibre in it is just good roughage, perhaps the fibre is there to help us process the plants better.
I guess I would describe my diet now as between Raw Paleo and Primal: raw aged meats & animal fats (like in both), fresh salads no juicing (like in Paleo), add raw hard cheeses for extra fat, calcium and yumminess (like in Primal), small amounts of fruit and nuts as occasional snacks (like in Paleo)...so far its working great, I am only assuming the ACV helps with digesting the flax oil with the plants...I guess
Since I have been including this salad concoction I have a very diminished want for fruits, whatever helps me not want fruits is welcome!
If I ever eat cooked meat (happens sometimes because my family are meat lovers and when I am out of food and see some beef stew I need to taste some!!!
) I also take a big gulp of ACV always, if I don't I will suffer more.
Although I am learning now to always have a supply of raw aged meat ready for me so I don't fall into the trap of being hungry and having a piece of stewed beef or chicken.
