Found this online.
The petitioner's Form I-129F (including all criminal background information submitted by the petitioner and any related criminal conviction information that USCIS discovers during the course of conducting its routine background check) must be provided to the Department of State. The Department of State will disclose this information to the beneficiary during the consular interview.
The question is when USCIS provided documents to DOS does the documents arrest/conviction are included with the petitioner name, and birth of date, so the fiancé will actually know that it’s him at the consular interview?