Lots of foods contain lectins. A short list of the "worst offenders" includes eggs, nightshades, beans, nuts, cereal grains, and dairy. If you're really worried about lectins, then you should be looking to eliminate those as well.
But: this is part of why you soak and cook the buckwheat. Otherwise, yes, it would not be very good for you.
We have buckwheat pancakes once a week. I soak them in yogurt for a minimum of 12 hours. We have no digestive issues when we eat them, and they're damn tasty; can't say the same for anything wheat-based anymore, which seems to stop me up like quick-setting concrete.
Now, as much as I love these, I wouldn't want to eat them more than once a week. They're high carb and they're a lot of calories for little nutritional return on the investment. If I were a more active person looking to ramp up my carbs, though, I could see how they could be a great food source to add to my diet.
I think this recipe is much improved from the original:
If you're asking "is it primal?" the answer is -- probably not really. I make it part of my 20%, though, and I would take it over a wheat pancake any day.