Huh. I’m not sure where I got that module, but it must have been in the beginning trying to figure out this issue.
Anyway - your suggestion worked and I’m up and running.
I uninstalled the module, then re-ran sudo pacman -S broadcom-wl-dkms to install the correct module, and then rebooted.
It works fine now.
It was a long journey for me to solve this issue. This forum post was what ultimately got me there.
I am running a multiboot Hackintosh (macOS, Windows 10, Manjaro), and so I needed to use this Broadcom adapter to get full functionality on macOS.
Thank you for your help with the last mile.