I don’t believe you based on my experience.
FWIW here's there documentation on cancelling which says it can be done from the subscription tab: https://www.siriusxm.com/help/manage-or-cancel-service
https://old.reddit.com/r/assholedesign/comments/100rb5f/siri...
This was early this year. Also app only (I don't have an XM radio). So maybe they've improved or maybe they are less aggressive with the nonradio plans.