It actually was on assumption that Kyrgyzstan's national currency should be pegged to USD. There is a rate quote for it on many tracking websites. Even if it's not directly pegged to USD. You might get a two way quote for it pretty easily. So it's definitely not a worthless currency.
What really? how is it possible to have a currency that has no value?
I Live in a third world country but it does not come to my mind that our currency has no value in fact corrupt government officials always after for money. They even used it to acquire assets so that it will not be that suspicious to have such huge money that could not compensate to their salary.
Well, I think there were just misconception or fake news. Every country has own currency and has value may not be tradable to other countries but to their place it could be use for their daily life expenses.