As the legacy US Airbus A321s now appear to have been converted in full to the A321K Oasis configuration, the A321L type has been retired from the AeroLOPA menu.
Current A321ceo types:
A321S: Legacy AA two class configuration with both types sharing the same cabin layout. Conversion is underway to the A321R type.
A321K and
A321R: New "Project Oasis: harmonised configuration. Note, both types share the same cabin layout
A321T: Trans-continental three class configuration
If anyone still wants to view the A321L seat map, it is still available.
https://www.aerolopa.com/aa-airbus-a321l