That's alright. Actually, would this mean that TW3 is less strict in steel/silver vs. monsters? Meaning not all monsters will require the silver sword now to be fought effectively? That would be cool, but I suspect they feel that would make it too complicated for some players. I've already read complaints from people who struggled with figuring out which sword to use in each situation. If they change steel = humans and silver = monsters to steel = humans + some monsters and silver = other monsters that could be confusing (just like this sentence. Oh dear). It would require research/preparation for each monster you can run into. I rather like that idea, but I don't see it as that likely to be implemented.
I think they will probably keep it steel = humans and silver = monsters. Changing it at this point would probably confuse even a lot of series fans, nevermind new comers. I assume the only reason he was using the steel in the trailer was for a bit of drama, so they could end on him dramatically pulling out the silver sword as he now means business. I'd like having to do a bit of research on monsters to find out which sword they are more vulnerable to, but it seems a bit awkward in an open world game, you'd need an awful lot of prior knowledge of what you're about to face.