You must be a Conor fanboi to say something so horribly, horribly moronic.
Diaz was chasing Conor around at points late in that fight. He had already recovered from the early flash knockdowns, so clearly he wasnt damaged at all.
You can say 'Cain took years off Junior's life' with some level of credibility, because Junior was badly damaged in both fights, couldnt recover, and was in no shape to be chasing Cain by the ends of the contests.
But Nate wasnt damaged to anywhere even close to that sort of extent. He got dropped early then recovered and was fine. He was forcing the action. No harmful damage whatsoever. Temporary facial marking because he has fair skin.
You're either a fanboy or a cretin. Take your pick. But there is no other explanation for that statement.