So, if I'm getting this correctly, the joke is that Murasa's main weapon for sinking ships is a wooden spoon, and now she has more output when she uses dishes to pour?

Also the fact that Futo's plates can produce water torrents.

Funayūrei – The ghosts of a person who died at sea.
Will use anything they are given to sink the boat of the person who gave it. This is why Japanese boats put out with a siv or ladle with no bottom or holes in it.