If the heater is fired on and off at 75,000 btu then yes. Do you have any fuel adjustment charges? Those vary on the price of natural gas and can be significant. Do you have a peak rate charge on gas?
So the real cost of your gas is 0.97044. The weather event is when the collapse of Texas grid spiked energy prices. This will eventually go away after your utility has recouped the cost. So now the cost is 1.0483 per therm.
If you want to compare to NYMEX and the cost of a MMBTU traded multiply your cost by 10. So delivered to your house the cost is $10.483 per MMBTU. NYMEX:QNN is $3.815 per MMBTU today. So you pay $6.668 per MMBTU for the transportation and overhead for the utility to deliver it to your door.