He's probably suggesting that in Virology it's generally frowned upon to publish research on how to for instance make Smallpox airborne and as virulent as the Flu. So it could be wise to leave out the exact details on how to make an AI recursively self improving when publishing. If you've spent time in Research many groups already do this by leaving out small but critical details that make replication difficult or impossible. This is across fields not just CS/AI