I don't think it was fake, but I do think there was careful preparation. This was not the first carrot he has played!
I imagine he has done some considerable experimenting with the hole positions, for example, to be able to play that well in tune. He would also have to have the hole positions carefully marked (center punch?) before he drilled.
Years ago I attended "new music" concerts when my sister was studying composition. It was a time when almost anything went. One of the highlights for me was a piece written for vegetable orchestra. The composer had modified various vegetables with conventional mouthpieces. The pickle-o was amusing! Yes, made from a huge dill pickle, drilled.
It is a good site for videos, isn't it?