I find it pretty hard to make sense of what's written in this article. After reading it, I still don't know whether you can or cannot hold or trade crypto in Bangladesh, and whether statements from their central bank are only recommendations or are they interpretations of existing laws and are legally binding.
The central bank's announcement came as confusion built after it sent a letter to the Criminal Investigation Department of the police that trading of cryptocurrencies cannot be considered apparently as a crime although virtual coins are illegal under the laws of the country.
This literally says that you can't hold any cryptos but it's not a criminal offense if you trade them

To be fair, it's probably not the author of the article who's to blame, but just the Bangladeshi regulatory mess.
Cryptocurrencies are currently banned in Bangladesh because the government considers digital assets too risky and decentralized. In addition, cryptocurrency transactions are contrary to financial regulation and state law. In September 2014, the Central Bank of Bangladesh reported that two crypto-traders could be sentenced to long prison terms under a strict money-laundering law.
Looking at the regulatory and legislative framework, one can conclude that cryptocurrency is completely banned in Bangladesh and this is not a recommendation. It's just that for some reason this particular article says these are recommendations.