I agree on that idea.
I think it is more due to the Reign of Superman connection, where Mongul senior served Cyborg Superman, so it makes sense that Henshaw have knowledge of Warworld tech.
It should also be noted that it was Henshaw (posing as Tracy) that talks about the current body of Metallo is created by "Warworld Alchemy".
This makes me suspect that this body was originally Henshaw's Cyborg Superman body, that Lex remodeled to make it into Metallo, that's why he is making Corben make a new body.Either that or the new body Corben is making is for Henshaw.
But judging by how Lex talked about "that body", I suspect it was Henshaw's original body that he created with Warworld Alchemy, that's why he knows so much about it, also explains why the body is changing into something else.