Having 2 Application folders in macOS Catalina
Can I delete the old Application folder?


No, you should not.

I looks like one (/Application) is virtual folder for another (/System/Volumes/Data/Applications).



To fix duplication in Alfred, just type reload in it.



More context:


https://superuser.com/questions/1454743
https://www.alfredforum.com/topic/13121-duplicate-apps-in-results-1015-and-v4
https://www.alfredforum.com/topic/13760-after-upgraded-to-catalina-applications-show-from-systemvolumesdataapplications-instead-of-applications