Disclosing your secret affair to HR would be a hilarious move...

HR of course has no particular duty to out him to Mrs Huang. However, on the other hand, anyone with access to this personnel record, so long as the affair remains undiscovered, has an extremely inappropriate piece of kompromat against the CEO of a trillion dollar company. Maybe that's a small list of people but it seems like a terrible amount of power, to the point I don't think I'd be comfortable with anyone having this piece of information in their heads, let alone on a "consensual relationship disclosure form" Docusign.