Solved
B-WL5M-SUBG1 available with no public documentation
B-WL5M-SUBG1 is available at e.g. Digikey/Mouser, but the ducumentation link https://www.st.com/resource/en/databrief/b-wl5m-subg1.pdf is still 404. Strange!https://www.st.com/resource/en/databrief/b-wl5m-subg1.pdf
