Biden himself is a creature of that conservative Democratic establishment. He was one of the farthest right Democrats in the Senate for a long time: proudly anti-abortion, more extreme on Israel than most Republicans, tough on crime, and friends with segregationists.
So it was inevitable he reverted to type, particularly after getting drug through the mud on Build Back Better and the Afghanistan withdrawal, with a strong internal push to move right and embrace a kind of soft white populism.