Dbvisit Replicate doesn't provide official CLI command to clear all or some of the stats.

The user, however, can connect to DBVREP schema on target database and manually delete tables DBRSCOMMON_RATE_STATS and DBRSCOMMON_LAG_STATS. Use table DBRSOBJ$ to get the correct OBJECT_ID for the table DBRSCOMMON_RATE_STATS if you only want to delete the statistics for a given object.

(This reply applies to all Replicate version, not just 2.8)