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As far as the two arguments go, I don't see the incompatibility. Can you share your thoughts about this?

If it was a "betrayal" then Nehru wasn't naïve (because betrayal implies deliberately misleading). OTOH, if Nehru was naïve, then it wasn't a betrayal (because it was so clear to everyone except Nehru that something was going to happen).

I think the truth is somewhere in between. I haven't studied it the conflict in depth, but it seems to me that China's policy towards the Indian border region changed (at least partially because of Indian actions), and India didn't realize it quickly enough.