Elon just wanted some attention, so he says the staff that he won't be able to achieve. He also knew that but his followers doesn't. If this was that easy, why doesn't he start extracting minerals from the moon? That is closer than mars from the earth. The cost will be lower than on mars and he can sell those minerals at a high price. Wait! I think he was talking about a metaverse world where he will open a hotel on mars!