The article fails to note that both those monoclonals CAN still be used if Delta is determined to be the pathogen. I would guess that while Delta is a small % of new cases, it is a higher (but declining) % of current serious cases.
I am not sure of the confidence in CLINICAL determination of Delta vs. Omicron? It has been stated on FR that Delta goes for cell receptors in the lungs, Omicron goes for them in the upper respiratory tract.