the databook even says it, it isn't baseless hype.Arm =/= eye. Just because tsunade can create an arm that works doesn't mean she can also create an eye. & Besides, using hashirama's dna kind of invalidates your point since hashirama's chakra = ashura's chakra = naruto's chakra. So it's still naruto's chakra that created the fully working arm, tsunade couldn't have made one without the proper dna.
This entire point is based on speculation.
That was his chakra network that was sparking up again, the result of naruto preventing his death. How do you know if the body can be repaired after using the 8 gates? How do you know that regeneration completely negates what the 8 gates does to you? All you have here is speculation with no legitimate evidence.
& Susanoo can destroy all creation, doesn't mean it's 100% correct.
I take a character's statement with skepticism without the proper feats, otherwise you believe the likes of hiruzen stands a chance against hashirama as the strongest hokage.
Again not proof that can heal an 8 gates user.
It wasn't an exaggeration.