You can try this:
Goto patch global configuration. Click on AIX tab. There should be a button to Update Filters. This will download the latest filters and post that if you reopen the catalog you should be able to see the new filters
So following are correct details steps:
Create an empty depot file.
Goto Patch Global Configurations -> AIX (Tab) -> AIX Updates List File -> Configure the empty depot file as the AIX Updates List File and click Update button. It will download all the filters to this depot file and you will be able to see the latest AIX filters in catalog.
This is already documented I think.
Download the new FILESET and apply in global configuration, this wil be fixed