Why is this impressive? Either they beamed it out through satelites, which is notoriously hard from an unstable platform on big waves, or they recovered the saildrone and obtained the footage directly which is equally impressive in or around a hurricane.
All around if the dating of the footage is correct it is very impressive to me.
[1] https://en.wikipedia.org/wiki/Comet_Shoemaker%E2%80%93Levy_9