I was confused by the use of the word “stow” which usually means detach first. But you are right - he just meant “store”. It is doubtful that they would use a traditional wiper. Probably their new linear design. Still, the blade has to fold up and down. I never understood how they can make it work without an upper rail and a lower rail.That's what Elon meant with 'stow in frunk'.
Maybe a flap that covers it.