Check nls_length_semantics=BYTE again. And again. And again.
When collecting statistics got ORA-20002: Version of statistics table … is too old.
Please try upgrading it with dbms_stats.upgrade_stat_table
Know why ? Because the statistics table was created with nls_length_semantics=CHAR.
Oracle compares etalon table SYS.IMPDP_STATS with your stats table and yes, column sizes differ because SYS oh, yes has column size 30 but your table has (oh, yesss) column size 120.