A nonconcurrent load isolated delete operation on a load isolated table or join index physically deletes the qualified rows.
A concurrent load isolated delete operation on a load isolated table or join index logically deletes the qualified rows. The rows are marked as deleted and the space is not reclaimed until you issue an ALTER TABLE statement with the RELEASE DELETED ROWS option. See Teradata Vantage™ - SQL Data Definition Language Syntax and Examples, B035-1144.