If the technology is suitable only to tankers and dry bulk carriers, that's fine too. Maybe the headline writers didn't know the difference, or maybe they thought the simplification of "cargo ships" was sufficient for a technology article for a general audience who (like me) doesn't know one class of ship from another (except for tankers and cruise ships).
Still, I will always be on the lookout for misleading headlines that are not backed up by the body of the article.
-PJ
“Maybe the headline writers “
The only job of headline writers is to generate clicks.