Hi Digits. I think it's not the genetics of Eskimos that determines if they have IBD or not. IBD is in every ethnicity and race as proven by this forum where we are from all over the world suffering the same (I'm from Lebanon with Arab ethnicity for example) , but you have to be genetically susceptible somehow to get it as proven by recent research.
I guess the studies point to the original diet of Eskimos which is high in Omega 3 and with a balanced Omega 3 to Omega 6 ratio of about 1:1, not their genetic makeup. In every community that consumes a natural native diet, there is very low incidence of IBD. Since the new diets became widespread, full of red meat, processed foods, hydrogentaed oils, trans fats along with low consumption of Omega 3, vegetables and fruits, diseases like IBD have been on the rise. As you mentioned that now there is McDonalds everywhere, maybe this shift in diet is causing IBD to appear also in communities like the Eskimos ....