Bitcoin would make it (a lot) easier for people to move money out of the country, so while this move does make sense as a hedge vs. their currency's decline, there's no way the Taliban is going to let this happen. Even firms like Western Union that have resumed services there recently has currently stopped outgoing services.

For the common people though, sure, as Bitcoin has proven to be resilient despite unstable regimes, but I imagine majority of them have more pressing issues right now.