Well, it was another banner week from the six unelected zealots who apparently make all of America’s public policy decisions.
I would assume that Biden said that because he knows it is not practical and would be a waste of his limited time and political power.
Obama made a similar compromise in not pushing for single payer but instead focusing on the compromise that became the ACA. He used basically all of his first term to get that passed, and while it may not have gone far enough for a lot of progressives–including myself–I sure am glad we have that instead of nothing!