This is certainly ambiguous because Bitcoin is of course a currency because it meets almost the same conditions as the digital currency. IMF is an organization that operates under the UNO which has a lot in common with state politicians. As you know, the government and politicians tend to avoid cryptocurrencies and want to avoid using them by their citizens, which is why IMF may not want to put such images in order not to popularize cryptocurrencies. It's sad but partial censorship is ubiquitous.