Just because the Health Care Industrial complex has LOUDLY endorsed Joe Biden, that doesn't mean Biden endorses them. He could still have his "Sister Souljah" moment and smack down this "Joe is running to kill single payer" talk, but I'd view that as a long shot, based on the fact that he needs money.
And yet, he did say that we are in a "battle for the soul of the nation" so maybe his all out pro-corporate stance on issues such as outsized guaranteed profits for insurers and BigPharma at the expense of the soul of America has softened(?)