Found this-- possibly it also means other options are better supported now.
https://www.ceoutlook.com/2021/11/17...usxm-hd-radio/
Update: A spokesman for SiriusXM said, “As BMW has stated, industry-wide supply issues impacting automotive manufacturing around the world have resulted in temporary limitations on the availability of some options or equipment. The number of affected vehicles equipped with SiriusXM was limited, and BMW has been back to installing SiriusXM as standard equipment for a number of weeks.”