You are correct, I was just reading and comparing the Sep 2020 and 2021 basic models (A180)Page 7 - A45S Standard Features - Interior - Burmester surround sound system ( 810 )
Check the bottom of page 5 for the A250 - Illuminated door sill panels with "Mercedes-Benz" Lettering
Check page 6 for the A35 - Safety and Security - Parking Package (P47) featuring 360 Camera (501)
Yup - no mention of this
My reading of the brochure is that the A45 inherits all the features from the A35, which inherits from the A250, which inherits from the A180.