I have no clue as to Lalibela's level of authenticity--but whether it is authentic or not is immaterial to me. The food is TOP NOTCH!!!! I can't get enough. Never had Ethiopan before I went here, but after the first try, I was hooked. My wife is good with a 2-portion combo, I usually get 3 portions. I walk out stuffed and good for the rest of the day! Delicious, and kind of fun to eat with the hands once in a while. I will warn you: if you have a sensitive stomach like I do, you will spend the rest of your day either extremely gassy or suffering from bowel evacuation on a fairly consistent basis. But it is well worth the trouble based on taste/eating enjoyment!
To the dope who wrote about it being "low class" and that you "would rather starve," obviously you've never been starved before (I have). Believe me, dipstick, if you're ever in that situation, you'll eat whatever is finally put in front of you in any manner possible, even if you have to lick it up off the floor.