No you don't . You still keep all your documents. Those are technically invalid. People won't care or check about those documents' validity in Nepal.

Someone of those NRNA rules are vague and doesn't make sense. Specially this one - Using an invalid Nepali citizenship for any purpose shall is ‘illegal’ and likely to be met with a punishment. (Details of the likely punishment is unclear as of yet).

How do you expect NRNs to do their daily activities ? Basic things like getting utilities, vehicle, or even paying taxes. Do they want to flash our NRN card every where? Does officials in those offices even recognize or know how to process NRN numbers ?