Yup, exactly that. We also use the US Dollar as main currency since 2001.
If debts are denominated in dollars, do you know how it will be determined how many Bitcoin would suffice for repayment (and vice versa)?
They're going to have a reserve fund of BTC / USD to make exchanging easy, and I'd assume that will have a rate that most merchants use.
Will $150million USD be a big enough reserve? Assuming anyone can exchange against that, I can imagine that being wiped out in just a few hours of a bitcoin whale deciding they want to cash out...
They can control the spread on exchanging against their reserve
We have not received much information, but from what I understand, the accounting currency would continue to be the USD.