It's a mix of both. Historically, interest rates have been higher than what we have seen in the last several years, so even before the pandemic started, the government could borrow at very low interest rates. The pandemic has pushed these rates to even lower levels, which very few people thought would be possible, but it did happen. Therefore, the government can now finance its debt.
There are the new borrowings, as well as the debt that is maturing and has to be refinanced at very low rates—which are below 1% for a 10-year bond and barely around or above 1% for a 30-year maturity—so it's a combination of already low interest rates before the pandemic and even lower rates since the onset of the pandemic.