Bill Whitlock’s lecture loves Romex. He also demonstrates that “conduit” is bad. BUT, he is describing BX cable where you can stuff it with lots of parallel hots and neutrals. BAD. I totally agree. But 1/2″ steel conduit with twisted pair hot and neutral and a single isolated oversized ground. That’s delicious and good. Maybe better than Romex. For that distinction I’d have to personally ask my authorities, either Bill Whitlock or John Chester. They would know, authoritatively, the answer to that question.