User blog comment:Fliu/Chapter 946: Luffy's Next Big Step/@comment-25161930-20190621183948/@comment-2600:1702:3C50:A6E0:A46F:B482:D797:A7FC-20190622040737

Examining how the Den-Den Mushi works shows that there are many uses for them. Given both the time gap in this situation and the fact that Wano is in name isolated from the world (Orochi has somewhat broken that policy) it would make sense that they wouldn't know as much about them of other similar things. We will need to examine this as the arc goes on.