In my opinion it is not logical. I believe that the political situation in Zimbabwe may have an impact on the price of bitcoin in the country but that there was such a difference in price I don't believe. With such a difference in price traders already would have pulled out of Zimbabwe dollars. For those who do not know say that the currency Zimbabwe uses US dollars. So I don't think what they are experiencing large financial problems even during the coup.
Zimbabwe barely has an economy and people are switching to other ways of payment since their local currency is a messy trashy useless fiat. For those who can afford Bitcoin they will use it.