It still works as of August 2022, but there are two tweaks needed as the FileZilla config file lives in another place now.
The new place for this config file is: /Users/{your_USER}/.filezilla/sitemanager.xml
Within the Alfred preferences, go to the FZ workflow, right click on the script filter and choose "configure object".
Delete the path: ~/.config/filezilla/sitemanager.xml
Input yout path: /Users/{your_USER}/.filezilla/sitemanager.xml
Have fun 😍