An "improbable weapon" that has an actual weapon inside/combined with it

I'm talking about this example of Improbable Weapon User:

• Wendi from Magical Girl Lyrical Nanoha StrikerS has a surfboard as her Inherent Equipment. Granted, it's a mechanical weapon which triples as a surfboard, a cannon and a shield. But it's primarily an aerial surfboard.

1) is it a proper use of the trope? 2) This Banana is Armed sounds like weapons disguised as something that is not-weapons, so would this example fit that trope? Trying to understand here.

Skimming more through Improbable Weapon User's pages, I've found more examples of "actual weapons hidden in improbable weapons" in them. Should I move them into This Banana is Armed or not?