You're right. I don't work for Tesla so it is a theory. However, if you'll take a look at the picture, there isn't even a place to put winshield wipers. There's no recess where the wipers would normally sit when not in use like in all other cars! I just wished it rained when Elon drove the Cybertruck to Nobu with his 5 girlfriends! That would prove (or disprove) my theory.
Would be cool, but I don't think we really know what wiper system this beast will have as Tesla didn't announce any details. 100% speculation/hope at this point, no?