In my research through my work with AutismFits.org, I have found the opposite. Going undiagnosed actually makes it harder. An example is my dad. He was young when he passed. He was undiagnosed until the last year of his life. He actually would have had an /easier/ time of things, had he been diagnosed. Lack of it meant being unable to inform others. This prevented him from employment. The employers didn't see an autistic and accommodate him, they saw someone oblivious, who talked to much about wires (he was a telecommunications tech), someone too tedious in following the rules, and asked too many questions..in short, they saw an annoying pest.

Multiple recent studies have shown we are actually disliked at a high rate based solely on appearance. We are rejected before we even say anything. An experience many autistics have felt and thought we were crazy, but the studies back this. What they also showed is, that rate decreases if the other person knows we are autistic. Early death most often occurs due to things like stress and struggling financially (can't afford doctors and medicines for health issues, housing, and enough food and other means that benefit in expanding one's lifespan). When it is undiagnosed, we have a rougher time gaining employment, maintaining it, and not being ostracized by peers making life harder and more miserable. It's not an escape from the consequences of being autistic, but /more/ of an entanglement in them.