Lebanon has practically two different currencies. If you put money into a bank account now, you can access it. It's the old bank accounts that are locked unless you're willing to take a 90% loss.
What has happened in practice is that the old bank accounts contain have actually dropped in value, but the banks nor the government can admit that. Hence, this situation.
Disclaimer: I have been to Lebanon a few times, and a lot of my colleagues are Lebanese, and my knowledge of the situation comes from them.
There are two different exchange rates: The official rate and the black market rate. The latter is the actual value of the money. No one can actually get at their money using the official rate. That's why banks have two different types dollar accounts, one for old dollars (prior to the crash) and ones that have new money.
What has happened in practice is that the old bank accounts contain have actually dropped in value, but the banks nor the government can admit that. Hence, this situation.
Disclaimer: I have been to Lebanon a few times, and a lot of my colleagues are Lebanese, and my knowledge of the situation comes from them.