You beat me to it. Ringers Lactate cost more but not much. Any pharmacists or retailers who can comment on this, especially in bulk?
The cost difference between LR and NS is negligble. If I were the patient in ER I would opt for NS. Very few drugs are incompatible with NS but many are with LR. In the ER in a critical situation you have no idea what drug you may need to push into the iv line next. Better to hang NS first and later you can change to other iv fluids if needed.
1% is not a valid statistical difference and it should be noted the study “made assumptions” with their data sets.
I would confine this study to the category of “interesting but of no value at this time.”