If he was a true dogefather then it was natural that he didn't have a shiba. shiba has a community with the goal of being a doge killer and this is contrary to the doge of course. Moreover, he is a public figure who certainly has a big influence in crypto so understandably if his statement can easily make the coin down in price.
It's impossible for him to try to raise two coins in a year, this will make a difficult job for him to do, even if he has a work force that influences him and a team that is always ready, moreover shiba inu has a community with the aim of making doge under him, this is impossible to do concurrently, there will be resistance from dogecoin developers if this continues to be enforced, this is what Elon Musk sees, so there is no possibility of doing it again.