To me, the Nigerian government are just clueless. Personally I've not seen the difference between the E-Naira and the bank apps If that's what they're trying to promote. Trying to promote cashless economy should be a gradual process.
Though the OP is not correct with claims that bitcoin is being accepted in Nigeria. Its only a few set of persons that are actually conversant with p2p btc transactions. Moreover, cash shortage in the country
 shouldn't be a yardstick to say the country is having a shift towards Cryptocurrency.