The article title is misleading though. It was for 1 day that they emitted more. So overall about 1% of us emissions if you average for the year or 100 times less.
It seems they claim 26 days not 1, but you are correct the initial assumption readers will come to is that every day they exceed US emissions.
More Accurate Title: Indonesia’s palm oil fires are emitting more greenhouse gases on some days than the entire US
Edit: OK I read the second half about peat and yes, the peat was sequestered before the fire so that is not good.