I must admit that I have to google Dongbei to know where that is, but I imagine from the name it is mid-north- a wild! guess! You're out of luck then, as far as oily food goes, unless you move with your wife to Taiwan, where you can find food much less to the oily side. And still use your fluent Chinese to work your way around what food it offers, seafood being no stranger to this island. And you will find plenty of organic food, as Taiwan is pretty high up in agricultural circles, and the organic sector should not be far behind.
Haha it means 'East North' or to reverse it we would say 'North East'. Yes there are places like Taiwan where the food is perhaps less oily but still way too oily to follow a Ray Peat diet. Any Chinese food is still gonna be about the same PUFA wise as KFC, McDonalds, Burger King etc. So the best thing is to cook your own food. To be honest though, wherever you live you're better off cooking your own food if you want to stand any chance of following Peat since almost all restaurants use bad oils. The only safer areas would probably be western food where its roasted/boiled etc.
Frying generally is not gonna be on my acceptable list...until people start using coconut oil that is.
Perhaps, you will find that Dongbei may not represent a large part of China when it comes to oily food, or it may. You would know better since you have moved a bit around China, though much remains to be covered. Good luck with your adventures there, especially with food.:)
Yeah I've also lived in Beijing and Tianjin for a few years. There are differences but the oil doesn't seem to be one of them. I've also visited the south. Even things like jiaozi (those meat filled dumplings) seem healthy since they're boiled, but they actually pour a load of oil directly into the mixture to make the filling. I've witnessed food like this and other cooked in people's houses in both Tianjin and Dongbei. They are definitely big fans of oil here.
Its a shame because in the past they would for example kill a pig and then use the fat from it to cook with. At least more healthy than liquid oils. I've even been to the (VERY) rural countryside here in China and seen that they still do that sometimes. Many of the habits of the very poor people in the countryside are much better than the people in the city.