We don't know but based on his tweet with regards to owning SHIB, he said none and he is not buying SHIB so technically he's not the man behind SHIB and beside we already know the team of SHIB so why keep speculate about Elon as a big boss of SHIB. The hype with SHIB was gone now, it make take another time before it rise again so if you are a long term holder, go buy at a cheaper price and know its risk of course, SHIB can follow the footsteps of DOGE, they are both meme token though.
SHIB is a new meme token and it is not shilled by Elon Musk. Last two years, I never seen Elon Musk's tweets to shill Shiba Inu. He makes many tweets about Dogecoin and even plan to make a Space mission with Dogecoin as payment method. Nothing he has done with Shiba Inu. It's big difference and you are probably right, Elon Musk and his team are not backing Shiba Inu.
They can buy Shiba Inu because they are professional and where can help them earn profit, they can join. None of us can prevent them to do so. We are all free with our decisions to invest or stay outside of games.