> Yes!
> 80085 is 00000000000000000 in binary! systemctl --user list-unit-files | grep -o "tracker-\S*\.service" | xargs systemctl --user mask
...wasn't enough. What did the trick was unchecking the remaining two entries in the "session and startup" settings dialog. Good riddance. It was the number one reason for my notebook heating up and draining battery.
Still, props to Bose for actively helping to keep their old devices usable.
[1] https://www.bose.com/soundtouch-end-of-life