MSFS will update the Asobo KJFK airport. If it was deleted via Profile, Content, Manager then it still not installed anyway but updated. Check from Profile, Content, Manager, Not Installed: to see if Asobo KJFK is available to install. Otherwise, you need to go back to Profile, Content, Manager, Installed: to find Asobo KJFK and delete it.
Be warned that IniBuilds KJFK has bumpy issues on runways not resolved yet since the released time.
Pat