She won the nomination handily?
His lead does not mean he is a sure thing to win. It almost certainly will tighten up. Bill Clinton came up from 5% in August '91 to win. But saying that it doesn’t mean anything?
Bill Clinton came up from 5% because he was an amazing campaigner with outsized oratory skills who connected with wide swaths of voters. Hillary Clinton lost despite a commanding lead because she was running against someone with similar skills and abilities.
Biden will likely not get the nom if someone demonstrates those mad skillz this time. Too soon to say that they won’t. But if no one shows those chops he’s the default nominee. The early numbers at least mean that thing.