Most people would sign something like that over spending thousands of dollars for a repair. Just imagine it is the battery and they choice is like "well, you can pay $20000 yourself or sing this paper and we take care of it".
Again, it's your problem if you can't afford to not take the offer. You should be thankful that all you need to do is sign some kind of NDA.
What I find hilarious is that people sign the agreement to get the free repairs, then go ahead and complain about the agreement anyways. Well next time you need an expensive out-of-warranty repair, you're not getting a free pass :P