this repeated tweets is not from Elon himself, report has it that he was hacked. Elon must would have not lowed himself to this level of trying to pump doge. people are just taking this tweets serious without making findings.
It is true elon musk is not that guy who would spam his tweets it is not him i figure it out since other thoughts that it was hacked and someone is using his account just trying to make people buy dodge so it can be pump but to be honest he really loves doge and he wants people to have a good profit as well because he knew that this crypto currency is the future too not only making some staff to make it into mars, but he doesn't delete those tweet and then something will going on and we're the ones who gonna wait for it.