People (including me) who assume Demon Slayer wield Blunt Weapons are actually wrong.

You say slayers do not wield BWs, yet the article in your link clearly says it can use both 1h BWs and the new sceptre.
Perhaps this piece of info was edited in later:

Max edited his Wordpress post since this thread was posted.

At this point, I'd say it's just best to wait and see. That way, speculation doesn't kill us. XD